Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaf1f65252b564c…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 13:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0012e4777586210fe8e665cc885b41b SHA-1: 704853e85a989e9c1333abcda2dcdd20f35f5b65 SHA-256: faaf1f65252b564c03fc72f7148d9f7f21792e6dcf6382330a51644d75f7a9f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=spider+man+first+comic+pdf
    • https://cdn.sqhk.co/kosibowo/iiyJ3fs/oxygen_concentrator_for_sale_in_the_philippines.pdf
    • http://ekzo-fruit.ru/78550434093af7zg.pdf
    • https://giberala.weebly.com/uploads/1/3/5/3/135306284/mokosak.pdf
    • https://cdn.sqhk.co/vafizolubev/Ysghvqu/13599383706.pdf
    • http://flash-sar.online/how_much_does_framing_cost41hy2.pdf
    • https://cdn.sqhk.co/gisatajofo/icFicie/92853884461.pdf
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/fudetazawogu.pdf
    • http://zavarivaemvmeste.ru/pl_sql_tutorial_downloadyo23h.pdf
    • https://mebagotu.weebly.com/uploads/1/3/4/4/134444887/nebuxavufegepudoruwo.pdf
    • https://cdn.sqhk.co/rajemaramiw/iimgfnV/file_manager_windows_10_alternative.pdf
    • https://cdn.sqhk.co/jofutagi/jh9FGiy/70136610027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://futotaze.epizy.com/importance_and_benefits_of_effective_communication.pdf
    • http://ribowofipap.rf.gd/zuretozonugibosikuwufo.pdf
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_e3fe0107df8245f19e78f65976e35f6c.pdf?index=true
    • http://femulupir.rf.gd/waterutobogubupux.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_f669f2c7e50245e79d3b6029c9b3d346.pdf?index=true
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_af2069d2ff5947a284e01b04cd03fae9.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_5d0789a90d7d430db2eb6f3065bd053c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010174.bin
b4555f62ba660d4657c98fc046a9173393ba5a4f940d46d6a094868af3059eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 5372 bytes
font_01_sfnt_off000113a3.bin
ba0723f71fb9071bded2716cdaf11fb29b868dfe80c191c046dcf3669a686d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 11372 bytes

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