Malicious PDF — malware analysis report

Static analysis result for SHA-256 76923a79ce3bc727…

MALICIOUS

PDF

71.2 KB Created: 2021-01-12 11:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 301bd8d76305f35567486a7751b3ae53 SHA-1: e1c60e16e36e3ea1f5841b7025bf85789dd9cb32 SHA-256: 76923a79ce3bc727e9f64779127755e789c59f490a3c8d303f24c96d97f86199
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in malicious PDFs to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafftec.ru/aws?utm_term=corel+videostudio+ultimate+x10+templates PDF link annotation
    • https://cdn.sqhk.co/ditetona/MiibfuL/best_sad_ringtone_2019_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5f9e7a258e627.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/juroresivovu-xirumavosupi-nugewawo.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/fodogaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a041f3a6.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/2652112.pdfIn PDF document text
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/mizurimime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ffab49a0ee86.pdfIn PDF document text
    • https://xepesosagar.weebly.com/uploads/1/3/4/7/134737956/tunitugefupubuka.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/e54b4f6d8537.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/fupudumejexa_xizogoxuba_mitoxarekaza.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/PRsDjiy/47746615411.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/gozilum/fda_compliance_policy_guide_section_555._425.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 3276 bytes
SHA-256: 3312f5a21984c1bc7b8dbe862caed293d106b755c7a3609db9a3dc428290bc9f
font_01_sfnt_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 5332 bytes
SHA-256: f9dc36212c52041aad524d7f6fc680a966b09af44323da74e5a68342e2f0fb28
font_02_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 10632 bytes
SHA-256: 75575f56dbe67e93c69d48e693249b7865ac31eb4651c26385ea2dfe3ddc91d2

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