Malicious PDF — malware analysis report

Static analysis result for SHA-256 76facdf66d69c1e8…

MALICIOUS

PDF

94.3 KB Created: 2021-03-23 18:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23010e7b2b11a6c3f0c4640f19c27c8 SHA-1: d98975b15af9597f0a811a8a0d1fbf4eec4cadda SHA-256: 76facdf66d69c1e82ecca414ffafbad77c40433b1c703957d339a1cee25f588b
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=toni+morrison+paradise+seneca
    • https://cdn-cms.f-static.net/uploads/4453102/normal_60277b22361c5.pdf
    • https://static.s123-cdn-static.com/uploads/4422658/normal_5ffb6f2c20c0b.pdf
    • https://static.s123-cdn-static.com/uploads/4417318/normal_5fcd46162cb0d.pdf
    • http://logvoz.ru/budoviturejumq9vc6.pdf
    • http://prodit.space/cosmos_carl_sagan_epub_download38thy.pdf
    • https://cdn.sqhk.co/tinipuded/9jjaVga/guess_the_movie_quizzes.pdf
    • http://flowerport.market/67269525837d6ss2.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60493b63b7816.pdf
    • http://hayatevesigar.online/african_philosophy_culture_and_traditional_medicine5km3i.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_603fd85aa3bc1.pdf
    • http://teenagetutor.online/xiximoteziruzanabenumuspjw4.pdf
    • https://cdn.sqhk.co/niwonosorude/Xjcgdjc/offroad_4x4_hill_aa_apk.pdf
    • https://cdn.sqhk.co/jegivoziba/hfjdkYd/chain_reaction_game_for_pc_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79a1517e-f707-4be9-847e-6744498ddf8e/nulizifezisepoxeka.pdf
    • http://fasokefukolu.epizy.com/leveling_guide_vanilla_paladin.pdf
    • http://puzuzebud.epizy.com/41003042543.pdf
    • https://s3.amazonaws.com/xupimaral/ganitubukunox.pdf
    • https://s3.amazonaws.com/magapeguwabe/bevixugiputi.pdf
    • https://s3.amazonaws.com/salade/xatofupidomitujunorolomuj.pdf
    • https://uploads.strikinglycdn.com/files/879a8690-d12a-4f5b-98d1-c0a4f2255f5b/41148789657.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133d7.bin
f94dec1376707fe8c3240e0d8cdea5550a9b3408e078cc84ef9a55eaf45a4058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 5136 bytes
font_01_sfnt_off0001452d.bin
dd245f9fc51b4d73d493b987a560cf53e6bbf2890485534284b0f9fd7fa1b51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1452D 10784 bytes

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