Malicious PDF — malware analysis report

Static analysis result for SHA-256 372a18a3386f7996…

MALICIOUS

PDF

123.5 KB Created: 2020-12-03 07:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4713f628f6678f43f86ac417bc3e644c SHA-1: 7503dad537b32db2b0f9c836edf76ea0a0f3c2be SHA-256: 372a18a3386f79969afca8664aac52bd45e94b3d2fdcefd0a070bb08f8ca502a
172 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a suspicious URL hosted on 'traffset.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are PDFs, likely for SEO manipulation or to host further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the presence of embedded URLs and the overall structure point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/strik?utm_term=eso+crafting+writs+worth+it
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5faf8e734a3e7.pdf
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/8104122.pdf
    • https://pimakiwukusa.weebly.com/uploads/1/3/4/7/134712386/sujiwesijaposare.pdf
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/sisodamevipe.pdf
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5fa2b1df59518.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/4e93d3ad3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce35cd2d-e744-45ee-a0af-2e0422e64a7b/87373341421.pdf
    • https://uploads.strikinglycdn.com/files/7acbb328-3e0f-4047-af57-84e7b8b13f13/94651104696.pdf
    • https://s3.amazonaws.com/xezonijida/i_ching_hexagrams.pdf
    • https://uploads.strikinglycdn.com/files/8abb3c57-a31e-4af3-bb66-0f77fc8a54fb/70083884598.pdf
    • https://uploads.strikinglycdn.com/files/6697d6ad-cc94-47bc-ac11-576f5e357ea0/57124385721.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0d44f8cdb769c6aa8c75/1606290756808/xeteje.pdf
    • https://uploads.strikinglycdn.com/files/6fcfc0ac-c9d7-4ff6-8bdb-4a60619f1410/jokijarojidurejafono.pdf
    • https://static1.squarespace.com/static/5fc06d09e5c7695ca9994347/t/5fc1044f64571256545f941f/1606485072079/concrete_mix_designs.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001796b.bin
10ba2f73994b202d812cd4501849d767b2687086d1e3433407898f58e40d7aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1796B 13672 bytes
font_01_sfnt_off0001a554.bin
eff2b20bc11db496d3b8e2f49202446a71c01b91f7a3f0237d3d0509217c5871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A554 5160 bytes
font_02_sfnt_off0001b6f7.bin
ecba13344a6e711f1833d31f34d7dba6552cfc6a6c75472c267c0c4a1a2dd319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F7 12772 bytes

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