Malicious PDF — malware analysis report

Static analysis result for SHA-256 074a993a68df6238…

MALICIOUS

PDF

95.0 KB Created: 2021-04-22 21:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 905fafce7350d25b9a76f62ecc97398c SHA-1: 994bb9167d6b1ed334760f0c322d778d1dbbfcac SHA-256: 074a993a68df62384a127d6d8bbad1837157e74f8d0346b020d838ae9a6d1c55
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a phishing or trojan threat. The heuristic firings reveal a significant number of external links, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=2005+cadillac+cts+v+0-60
    • https://cdn.sqhk.co/zamupefa/gxB6jah/26027893318.pdf
    • https://cdn.sqhk.co/budatumibowu/MjiDycM/super_fancy_pants_adventure_flash_game.pdf
    • https://cdn.sqhk.co/ganinidunop/g21ggjc/sujazefikumepifekuz.pdf
    • http://itawegan.space/ipod_nano_6th_gen_not_turning_on1qs67.pdf
    • https://cdn.sqhk.co/remezebona/Iegg4E2/83160952888.pdf
    • https://gidixolatuloxag.weebly.com/uploads/1/3/1/0/131071157/3504081.pdf
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/79eae.pdf
    • https://cdn.sqhk.co/pikukafil/fBhdDic/ammerland_clarinet_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://riwevanopa.epizy.com/51457949524.pdf
    • http://luxovas.rf.gd/83707347595.pdf
    • http://linakagiwabofa.epizy.com/line_6_pod_hd500x_guitar_multi-effects_processor.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_19b43ba917a041eeae6dd5862fed6f14.pdf?index=true
    • http://ridibodivusunob.rf.gd/midipubupij.pdf
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_b8fca3e6be9f44399f8204e2851f929d.pdf?index=true
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_16778aa8cb92496fb762caed2eb550f2.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d8e.bin
6e1d58831ec05fa71ae8a0b45a7472bd79707a9ca8df681204307368c3e9c0d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 5388 bytes
font_01_sfnt_off00012ffe.bin
8e4c88f8f25fbb1e0422b83b27d94c10730162248a76b0feec8502440c2c7de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 12224 bytes
font_02_sfnt_off00015847.bin
9900a2061f4db6d5851a1fb623229e1c91a1f2215fec638d1e55d9f0c32ecb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15847 16088 bytes

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