Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a5b25ef23c6db8…

MALICIOUS

PDF

68.5 KB Created: 2021-03-02 14:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fec6c689c17169d75503a98eb9cc8a80 SHA-1: 29f10f2cc26047152f7563f507d8cadd7fb709f2 SHA-256: f1a5b25ef23c6db8c4b13f18d90a88942ce57e5523d108794150112439e5afa1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious content.

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://leonvi.ru/wix?keyword=fe+chemical+engineering+reference+manual
    • http://chaptejvxz.fun/35424055781di0lq.pdf
    • https://cdn.sqhk.co/gowamojon/cNjbBif/63586260747.pdf
    • http://vivekawiga.sportsontheweb.net/molesevumad.pdf
    • https://cdn.sqhk.co/penazavoxu/ajcie3M/virosis_en_tomate.pdf
    • https://cdn.sqhk.co/kimejijomaki/E5je2ge/stories_to_read_online_for_toddlers.pdf
    • https://cdn.sqhk.co/sabumijobude/oegdPhc/31877756017.pdf
    • https://cdn.sqhk.co/tumosirewuw/FjgBgcV/rekelojeruverurikatox.pdf
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/2dfdc64747e4a20.pdf
    • http://nasufulorejuwe.mywebcommunity.org/gapifufefebokemewitom.pdf
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/nalilavukibum.pdf
    • https://cdn.sqhk.co/pamavunawi/igojfeM/simple_valentine_cake_decorating_ideas.pdf
    • http://ozalupa.space/vonunaxironutaxifokubupig4d90.pdf
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5ffff38b1c576.pdf
    • https://cdn.sqhk.co/vexorikodo/jgJdUZV/91368445537.pdf
    • https://static.s123-cdn-static.com/uploads/4379839/normal_5fe4a65f5fdaa.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_off0000cf91.bin
27d5c0ef5ba6acacbe5a0154dfe801ad311c3ac6ea6020f96f52bc1bc707819c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 5072 bytes
font_01_sfnt_off0000e0a8.bin
a4a89fb7906ee4c0eb1a812e3bd04ad089dd88b0f176b9f1ce3c58c7071d377e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10616 bytes