Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff3e38b8f54f612…

MALICIOUS

PDF

82.7 KB Created: 2021-03-29 16:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1b43f0fb56d49c4fce57a4edb300ab5 SHA-1: 1acbd768fb6826dde2419b7caf9ce8f921f53fb1 SHA-256: 1ff3e38b8f54f6128128ec138bf121b9e04ca99ef06dfcbd671a5b623bde0f87
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crophysi.ru/123?utm_term=tense+consistency+worksheet PDF link annotation
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/gegosanazemejidavoxu.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/gazuxilele_jokutekan_logeje.pdfIn PDF document text
    • https://busudege.weebly.com/uploads/1/3/4/3/134392642/222699.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/jiginivev.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/fyA1qie/colony_bmx_rims_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/qwlRiid/fijado.pdfIn PDF document text
    • https://xinuxarovota.weebly.com/uploads/1/3/0/7/130776268/neluvatijarumi.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/bgffibP/50858097826.pdfIn PDF document text
    • https://tejifogigevavep.weebly.com/uploads/1/3/4/6/134675995/ziwuponime.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/Oahazhg/forge_ahead_game.pdfIn PDF document text
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/sakupovagojiza-kogazif.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/ggjejiB/39058285388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/45380b48-b24b-4614-8c8f-15ffe21e5257/83303941396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2392c2b9-180a-4279-8b23-74a8af2a96d9/in_what_order_should_you_read_sherlock_holmes.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_dde6689d1cae4cbba6b6886aa88e17fd.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_d5518b672aed424696a8ccc3444c0726.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e30215-96e4-441d-91d1-a78ef23925df/fenimalilenapeguxe.pdfIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_2af9660afdc04000b69859a59ac6147e.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_87d69a99b07b4802a5e0b129b72ea9d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a44750-b43b-4c63-a971-ac5fd0516322/23458408889.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_f1de97b8fe0e42a1ba30ae78283f559f.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 4640 bytes
SHA-256: 2570db7f6b34025143628c9997e5b7ff50aafd60adc3f92f071f98750ee1ae73
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10744 bytes
SHA-256: 84780e42caafe65856465adfaf7c07cf1c1964561b752957bf7cf804b7e175ba
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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