Malicious PDF — malware analysis report

Static analysis result for SHA-256 38575562a4ff1202…

MALICIOUS

PDF

74.3 KB Created: 2021-02-27 01:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65ae033f9b79dd9d04534c1618736c34 SHA-1: 57734cbd70a9677682ea3924721caa8a9b27d794 SHA-256: 38575562a4ff120270a741b42162005402f89c47ed7fb5694ddfddf238caef7f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=why+wont+my+schlage+lock+lock
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/bcd6d436dbf.pdf
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5fe5453943b0b.pdf
    • http://haifaiv.ru/how_to_complete_brain_out_level_38vac6j.pdf
    • https://nixixope.weebly.com/uploads/1/3/0/8/130874324/938d907ef5b645.pdf
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/f9ba7f.pdf
    • http://madamzero.com/56447155319dehpb.pdf
    • https://cdn.sqhk.co/bulixanejad/8xpGicW/scrabble_word_finder_espanol.pdf
    • https://xujeloza.weebly.com/uploads/1/3/4/0/134096435/padirusofux.pdf
    • https://static.s123-cdn-static.com/uploads/4489740/normal_5ff970a149d39.pdf
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/2847381.pdf
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5ff757db2559a.pdf
    • https://cdn-cms.f-static.net/uploads/4471509/normal_600f85ecb3399.pdf
    • https://cdn-cms.f-static.net/uploads/4499651/normal_5fd2a8eeda974.pdf
    • https://cdn.sqhk.co/sevafeluba/VVIDgfh/64835846623.pdf
    • https://wusezituvita.weebly.com/uploads/1/3/4/6/134608160/dakodi.pdf
    • https://cdn.sqhk.co/mivadunoxo/MsigeWP/restaurantes_modo_tasty_diners_club.pdf
    • https://static.s123-cdn-static.com/uploads/4459180/normal_6006c6db9f44d.pdf
    • https://cdn.sqhk.co/nedabuke/X3kIhic/neon_chrome_ps4_trophy_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e791.bin
dcb42312c981fab2b0cfa9388ea00fd6b5ce2419381f7b6ec98aa6ce2f27e696
pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 5388 bytes
font_01_sfnt_off0000f9e8.bin
5a78425d7fa8a9531d8688fa5b66770d7bac75240c6f6505c958c241ece8937a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10028 bytes