Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cc03ceeb45cf7e…

MALICIOUS

PDF

70.8 KB Created: 2020-12-27 09:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c1a6b84a5e7823b1312e97ccd4c09b7 SHA-1: b31486c9b809934f9086688987aa22e3a11c2f35 SHA-256: 52cc03ceeb45cf7e41e081fd65cddeb80398c120253fa1c2a17ba3ac0738ee05
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a campaign designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=shogun+sushi+metairie PDF link annotation
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/654767.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/R2ed7MQ/fepuxumas.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/MciaidQ/download_game_guitar_band_battle_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f8c90ef1a647.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/jdzLOid/talking_lion_toy_good_wife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5fe82b4d20bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5f9756dc0293f.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/if3fjjW/81268420828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fb3c4b193384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fe0d1029f616.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/hao5ujc/switch_lite_vs_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_5fa5b592d1efc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f90dc78b53a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_5fbebfe813ce8.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/gdajjjb/lupivovasutikojum.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 5052 bytes
SHA-256: b7ba91cedd34d38c74008d9ad8a04e3dcc6b88d306f2d558e2830d83bd71e360
font_01_sfnt_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10412 bytes
SHA-256: 935bc4f0feeb013c6e92c3ff4f5b9f64b3c10051097067906824eaf050157456
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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