Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c65c2d44cd8598…

MALICIOUS

PDF

70.9 KB Created: 2021-04-28 14:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0ec9128048a228fa9ff01f0b4d151c60 SHA-1: 8f77703c46a6f2d7501a1e4912a514f0ab37857b SHA-256: 10c65c2d44cd859878f36bd9b680c0b0a8723ae81d029cef4cd8124b8e2648a5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.7693

Heuristics 5

  • 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
  • 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://golowaki.ru/strik?utm_term=baldur%2527s+gate+3+future+races+and+classes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426819/normal_6006f9d687f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_602a84221bd26.pdfIn PDF document text
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/0f29a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_600fdf13ab1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_602ec60957597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_603651c5bd39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_60582293f18cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_60563a8d2d299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6029c765db46b.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/ca5f6ae3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd88139a5d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_60379dbc75b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_600d7c32901ec.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/1232911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_604fea6083a26.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/japivejuke.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/zuxetorez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_601d22c0499f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_602259767ead1.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/088789e0-ddd8-4749-8ee7-5ae58095fa24/97192787437.pdfIn PDF document text
    • http://baritobaseben.epizy.com/22043857745.pdfIn PDF document text
    • http://bapaxofobawob.rf.gd/laselik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a90601-1e6e-464c-9df2-aba28b50f864/how_to_make_money_in_stocks_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef19f95-a700-4a6c-b37f-de2649eafda6/bixifesikisexame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e508562e-504f-4688-b80e-c2126d5bd8e5/talobedu.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 5436 bytes
SHA-256: 590a97e3685ebf13a81ccd75e715aa117ad956553b62cd101dc285be743bf209

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