Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a8675cb0638aa9…

MALICIOUS

PDF

89.3 KB Created: 2021-04-02 20:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a585a6f6d9271db68230eeed56e40e57 SHA-1: 0a65fa3381666d86f035a29604fd1e79d81727c5 SHA-256: d2a8675cb0638aa962e1967b58c717e8e6afa7f6d338e0e744b890c586c1bd10
186 Risk Score

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 0.9988

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://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/1836306.pdf In PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/rojevas-nekazoleg-zejagogomizol.pdfIn PDF document text
    • http://ig-about.net/what_things_are_illegal_in_canadajzwbu.pdfIn PDF document text
    • http://probmaka.tech/23923741625xp3n4.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/8594401.pdfIn PDF document text
    • http://tersq.fun/1__3v22m1.pdfIn PDF document text
    • http://heliusdesign.ru/medagokjtd6.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/xotawajevanazupafawi.pdfIn PDF document text
    • http://slmit.fun/gojefoxivokigumuniriwogzz10r.pdfIn PDF document text
    • http://gratoraama.website/reneserorofobyi0aa.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/nokenazukaso-kojikavoma-xesoneto-dorotuketo.pdfIn PDF document text
    • http://imkl-checker.com/lopasugiboxupkm2rv.pdfIn PDF document text
    • http://irisca.online/how_to_learn_first_principles_thinking8unsz.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/46307855752.pdfIn PDF document text
    • http://chebsvet.ru/xavuwinusepugx8q2j.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=hp%20photosmart%20c4580%20cartridge%20not%20detectedPDF link annotation
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_b41180a0eda74c34a84e33973269a9d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/hollow_knight_brooding_mawlek_guide.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_15a9f77ed9834146b6d0e53cb0286a16.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_c303cdc5a33d4103a101c2feddac41b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/renisarodizise.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/bamuxaxazekaba.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_6d7d2594f60145e399fe2fd1bc80e2f0.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_c2c20f1f88e54efe8eb85e0ab29ceec6.pdf?index=trueIn PDF document text
    • http://zizenatoxu.myartsonline.com/60727930845.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 5752 bytes
SHA-256: bebebae33f4f5afe1b797318faff3967b8c84eebf70003c4d4d1844666c84d7a
font_01_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 11340 bytes
SHA-256: 4aeca90dd3cfc8ef2dff439bdd216e63c57ca6aea5410aa3cacfb753fb7f2b4a
font_02_sfnt_off00014988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14988 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3