Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2422c8a46c1604a…

MALICIOUS

PDF

69.3 KB Created: 2021-03-15 21:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8a54ef5719e5a4dddc16a361437cf062 SHA-1: 1a13c910d2d9680fc4c8cbf79fe437ce4eb16b4e SHA-256: e2422c8a46c1604a1b23690e2363135adf30d5c79ff5c0b2d657e0e34bafb469
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external links. The presence of a link farm suggests an attempt to redirect users to potentially malicious websites or to manipulate search engine rankings, aligning with phishing or SEO spam tactics. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://gimoguvi.ru/aws?utm_term=citizen+skyhawk+wr200+blue+angels+manual PDF link annotation
    • https://cdn.sqhk.co/vakujediraw/Thjjcjh/encyclopedia_brown_racist.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ahjTjjF/random_space_empire_name_generator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_6006120493d31.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/ibYhhgh/honor_showroom_in_hyderabad_kukatpally.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5fff9ca140264.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/Xcbgejc/walking_dead_season_11_rick_grimes_return.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_6023f5cadaad8.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/GhgLRja/57480704393.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/7br7Xsr/ninjago_lego_sets_season_13.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/bicjgqc/sago_mini_robot_party.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/jZjjigQ/vamijiwuzowo.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/vgdjcjb/22488171362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_85d2ba2f26d042e6b3ccf0fe8aba2487.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_68208a51cbec4102869b57997b839e51.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_4838a500045f485bad590245a182c2b3.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_f14a3e31cb7a42e78c16b17e17ed81b0.pdf?index=trueIn PDF document text
    • https://c1d122bd-fd92-44b0-961a-62888e3e1789.filesusr.com/ugd/3bcfef_cc6e74e5b541447b9c458c5f9c002f8a.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_31b4392672034b378e9ca78481f59432.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_cbef10c5b69a4cd1b32df528cecb94de.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_745d7683dc7f4ea3985ccef87f2b8044.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_930e2d4639a649f7953714e76d8f0d87.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 5724 bytes
SHA-256: f2827da14d2c93e34fac5892f442f203588f2c5e301d036523048b3e24301083
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 11612 bytes
SHA-256: bbe94df47f234a1d5c67574cd104e24580071426b9e2a11949966ffc038b8f71