Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c7ba195c794fc1…

MALICIOUS

PDF

83.2 KB Created: 2021-03-14 11:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b5578b7714eac966b63f46175972aede SHA-1: 042205ba99a733cef608cd85f7dfdce684b64f7f SHA-256: b6c7ba195c794fc1e9c0b3674ee47979636e77a2cce9413c1fbc8725bea3d57f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to disposable domains and are likely part of a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest a malicious intent, possibly to phish users or redirect them to malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=toastmasters+interpretive+reading+manual+project+2 In PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/3616989.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/d5972.pdfIn PDF document text
    • https://dalokagamamis.weebly.com/uploads/1/3/4/6/134695183/padujuxusibijudipu.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/5721990.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/301d08610.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/rifuxame.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/4300bbf.pdfIn PDF document text
    • https://luxutavu.weebly.com/uploads/1/3/5/9/135964445/6626005.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/characteristics_of_good_programming_language.pdfIn PDF document text
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/vutugasuruv.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/2519171.pdfIn PDF document text
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/vemilubijunagod.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/e5846b.pdfIn PDF document text
    • https://porepegozid.weebly.com/uploads/1/3/6/0/136050151/6e61decfdd72.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/how_do_i_pay_my_dish_bill_by_phone.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/2712376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_7106fc9f4889453eb809ac39e6283809.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffc40f2-8c2f-42c6-9a94-cdc56cf2020e/27562780136.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_3b68c428b55f4c8c968c11f4cd039d05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a209faf-e0e0-40e4-aef0-09cd498dab1e/p90x_workout_sheets_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d246f88-e3f4-45c6-90fe-995bb2000229/how_to_fix_a_cuckoo_clock_pendulum.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_29a5cee777be4c3c98d4fc5210ff53e9.pdf?index=trueIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_0f34cf1ec9424a50858eb98cdae2ca7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cdbad2-37c4-470d-acfb-fd5f1a1c5fc3/nojabopowadulilotaruxe.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/bicillin_la_package_insert.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/2576182993.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 5612 bytes
SHA-256: 67dea32fbdd38a9f37e07baa9e0df16534c20852d6abb2f23ff0f673dda7d4b5
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 11068 bytes
SHA-256: f710c835e50e0621f956f06f16f0c916c233207eb8f47746f95647e37b9692bc
font_02_sfnt_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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