Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0872694612bd9f…

MALICIOUS

PDF

72.5 KB Created: 2020-12-23 16:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f4319a3d22e4890f4988370ab07520bc SHA-1: ea6ac941ff85ad319d80dec3550db550ebfbb4fe SHA-256: bc0872694612bd9fc108a66c14e8eb9dcb3bf57e62cf806e7912bed3e6cb2402
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 0.9997

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://trafffi.ru/strik?utm_term=run+2+unblocked+games+66 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f92133358301.pdfIn PDF document text
    • https://vudepupebowazuk.weebly.com/uploads/1/3/4/4/134472779/4302670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5fa68c4949dbd.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/d092e62ee5.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/7974350.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/tejaxosipigezag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404750/normal_5fc5b4ce4f6e4.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/9614394.pdfIn PDF document text
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/kawijofanoz-xorezat.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/a8e50955-dd00-4bd1-85f6-f42c75bf5a53/achievement_unlocked_get_off_your_seats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416e887e-fa2b-4d42-88a1-1445fa0cfacd/jixuxuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd47409-8997-4493-8b00-8ad1899f61e3/potential_energy_diagram_worksheet_answer_key.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 5660 bytes
SHA-256: 6aabc1b4e6c16c89ee445233e095d01c43f3c60d29195eeb0cad7a37e8b57212
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 10968 bytes
SHA-256: e5543cea06cd2c5b4d9b31459493da0a7158f9adb2d254ac1dd3976fa8ef59fd

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