Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9548054761c2bd4…

MALICIOUS

PDF

73.1 KB Created: 2020-11-17 04:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac7f593b303f0e8dd5b3432140e8da2b SHA-1: 2ace99bfb12eb865662bb6572923d8678694916d SHA-256: f9548054761c2bd405c63c2172c91360cc46e7e55eb6081409374b4c2b88c3a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://traffine.ru/strik?utm_term=bionic+turtle+frm+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481839/normal_5fa695c034711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f8d08d571604.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/ac0523e2.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/098e9fe.pdfIn PDF document text
    • https://biwefixosepow.weebly.com/uploads/1/3/4/3/134334309/bolodu_wivovipajev_zexid.pdfIn PDF document text
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/c38b80d1a900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_5fa552bfa6d6a.pdfIn PDF document text
    • https://tototatinup.weebly.com/uploads/1/3/4/3/134332383/1767484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f9184f8a6fe0.pdfIn PDF document text
    • https://mamamusesutur.weebly.com/uploads/1/3/4/3/134359404/4d8f13.pdfIn PDF document text
    • https://mawubisevidezo.weebly.com/uploads/1/3/4/4/134480432/venemezatujowupe.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/d962fbf2-effc-4f51-91ee-b2512c312a7e/getujon.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 4960 bytes
SHA-256: a8ce6b9f1e4e11fd77754b5ca401f19d41e4c2e0391ce56518518a71b8952d61
font_01_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 10092 bytes
SHA-256: ed77c3459bfed7dc43f60f3ddea68bc731a2e505ef49876b5bae89597ff2d6c4
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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