Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbdb158ecc6d574…

MALICIOUS

PDF

84.6 KB Created: 2021-03-23 23:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 278578797effae62de4327baf8727663 SHA-1: 2111616cfc82d016c0e62465db02e23888738a3b SHA-256: 6dbdb158ecc6d57424f4fb956c3d0d88b0a7bab5383dd8ce01e162b2db72d3b5
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. The document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malware or lead users to phishing sites. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM firing strongly support this attack pattern.

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://kuzutuzo.ru/award?keyword=kubernetes+tutorial+pdf
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/rovixogazogiki.pdf
    • http://amandeepsadyora.com/lijilosaxesizosodesi5ou2p.pdf
    • https://rosujukasawi.weebly.com/uploads/1/3/5/3/135301647/2880997.pdf
    • https://cdn.sqhk.co/parabeset/jHmXWii/equalizer_3_denzel_washington.pdf
    • http://drive4mclaneaustell.com/63760040993698gn.pdf
    • http://mitedujonajezed.scienceontheweb.net/my_cousin_rachel_1952_cast.pdf
    • https://cdn.sqhk.co/redixebu/1ajfhcY/zuderosalepomumokenawew.pdf
    • https://cdn.sqhk.co/dirotiweze/wjfhhGu/70930972421.pdf
    • http://lnstagaram-verifiedbadges-from.com/explain_the_word_rainy_season1pj0a.pdf
    • http://cancandance.org/95268393192zbpm8.pdf
    • http://sq11mini.com/769860181141kksk.pdf
    • http://fruitslope.online/69751901687sd1nq.pdf
    • http://tokio-2020.fun/my_cousin_rachel_1952_english_subtitlesgftdk.pdf
    • https://cdn.sqhk.co/bilanogakiw/fHjdgdA/63510399708.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/wudigo-xameruforu-vibalo.pdf
    • http://girlita.space/visoj1umu2.pdf
    • http://fuzabura.sportsontheweb.net/wutop.pdf
    • http://save50it.info/why_the_sky_turns_red_when_the_sun_goes_downzxanx.pdf
    • https://cdn.sqhk.co/busumodofu/ahcwuib/slow_motion_video_editor_apk.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_off00010bb6.bin
9a3f585fd621a2ada2c21c4cc6f9058265a074d7428953d3d5f431bc359653f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 5144 bytes
font_01_sfnt_off00011d41.bin
d8fe2c16ed79b667799d2c89c0da39b32404dae92be085a56a5ec987916cc0c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 11676 bytes