Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9c26e9e50587d1…

MALICIOUS

PDF

80.4 KB Created: 2021-03-28 10:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e14433d04e79cb54d7469b8f6518509 SHA-1: ae7ca66f9317f9533c94c4ad5128be76055ff98d SHA-256: 8a9c26e9e50587d141d7abbe1f81823f6c8f8f288ef9906a95917437ddec176c
126 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 0.8449

Heuristics 5

  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://jottigo.ru/award?keyword=internet+banking+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6009d550e832f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fdc7e8e0ea46.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/halBiaq/electronic_probe_holder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450631/normal_60038a8009469.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/zotabekuwenazixoxin.pdfIn PDF document text
    • https://cdn.sqhk.co/tawumemikuva/e9nibjj/jenejonefubisomarinemutan.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/80077123898.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/fisher_paykel_dishdrawer_dishwasher_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/h7Hijge/residual_definition_economics.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/hgihjbP/world_of_warcraft_toy_weapons.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/what_are_basic_lab_skills.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_603154208016b.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/8bd685b6-8372-4bb3-9210-5538057bc837/jezukikegasef.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_5e7e10dfaec947c6900f2b074b3972ed.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_4eec7af4073f401db6f6337cfd909b18.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_ebdaa07a1bad4461ac6568e8a591caa5.pdf?index=trueIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_69a2aa275f734bf896c3fbf4d4c117fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/793c8ccd-9a49-435e-b996-8af37ce3c8fb/kepovoregijesejukada.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_c471f05aeade4c6a8c1b8ae8c4a44b27.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/lokebelakale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453103db-777d-4332-a91a-a5d807304483/5139216577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71440a52-dd49-4ab3-91ff-fab2a02d664e/dunajeroliwuwuvoligumu.pdfIn 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_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 5252 bytes
SHA-256: d3b1e034ab32f9d902e7cb412f259768ddd2679feb0a62f316ed2e92b3914afa
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 11796 bytes
SHA-256: 57038e94c9da783c629961716d672c851c67a37bcba199e4429ebbf9573871c5
font_02_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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