Malicious PDF — malware analysis report

Static analysis result for SHA-256 426ad331c2b9253e…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 19:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77be81d23a00b23e3fd1bfb12cf34626 SHA-1: 9b497255d8a1bcafe5dfd48c7b903f01c514fac4 SHA-256: 426ad331c2b9253edf23d8098df964047501f82e968954fccc87060be364b748
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 0.9998

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
  • 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/strik?utm_term=civic+auto+to+manual+swap+wiring PDF link annotation
    • https://sedapelagug.weebly.com/uploads/1/3/4/1/134109100/b671660f2.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/vemifotojufigituk.pdfIn PDF document text
    • https://dipibuwedaji.weebly.com/uploads/1/3/5/2/135293441/xejukazokujuligu.pdfIn PDF document text
    • http://tibujodokerijer.22web.org/teposomeferiroxi.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/c9edc02ccfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c9b59e-1140-4a70-9cde-0d726d60326c/41982250991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd866d6-44ad-49c5-85e3-78802f7b23e4/the_rules_book_amazon.pdfIn PDF document text
    • http://fusarafabar.epizy.com/nulokoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8fc70c-5e8a-4460-8f22-ebc7433556c2/ny_road_test_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63589060-b30e-49ea-822e-37f939e7e9ec/72150658978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823cc1bb-0a86-469e-9a6e-04cd4b5ff6f4/91441199787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951c3ab8-6816-44b3-b1d7-4a7130154bd4/goxifotati.pdfIn PDF document text
    • http://tosawivigibi.rf.gd/how_to_tell_the_weight_of_oil_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a535171e-4dea-44ff-b57c-30a0b9781c8c/zuzewakanupesadolutore.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_8ed31e31a9bd4d7d98f8080af7aad2c1.pdf?index=trueIn PDF document text
    • http://jenimubi.rf.gd/texas_gdp_per_capita_2019.pdfIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_20eb4d9caf45429894ca613de0986dd3.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_8748af728789492fae63a91f8c2680fd.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_270767a834214c09961adf666989d062.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5308 bytes
SHA-256: fdd27fbca4edbea23f9d35558debd8c36794c5b1676d3ced79f24ebb2360b086
font_01_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 10528 bytes
SHA-256: d2a2ca25cb788b88234bc3fcd4959c6760c8790ad06fa87652b8f2adf5a52f6e

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