Malicious PDF — malware analysis report

Static analysis result for SHA-256 5049a923cc9ab528…

MALICIOUS

PDF

68.2 KB Created: 2020-11-21 10:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 93c31ecf57002c6e80ba6fab9a17beeb SHA-1: c1e832aab832b28916ec6c6082040ca1dbc80901 SHA-256: 5049a923cc9ab5288d3c737ad6b4fa2c078a251ca410f5fa2a718af8161d1a3a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links to known malicious redirector infrastructure and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'free pdf download', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=knife+of+dreams+free+pdf+download In PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/3729972.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/b578937770d65.pdfIn PDF document text
    • https://xezorilim.weebly.com/uploads/1/3/4/5/134588859/pokasasavupa_lakewizokoxusup_netegidulexadom.pdfIn PDF document text
    • https://lutapojedexom.weebly.com/uploads/1/3/4/7/134747239/kixuxegunesenejuzipa.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/2361447.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/piloxub_vaxemejelan_kozepos.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/7140608.pdfIn PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/97105deae42.pdfIn PDF document text
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/9178066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5faf590b59b79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pujinit/car_racing_game_3d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d569a90-fd65-4cfb-96c9-21dfa0191233/jometadulijef.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_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 5248 bytes
SHA-256: 3fb6faa3f757ec3b935d9d015cce6c1e10ce933af66616b1e94dd01b823ee256
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 10800 bytes
SHA-256: 79803b7926f86a1a9194dac351f5c445fc11fb51ec898a154a8b1ad63738ef70

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