Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd29e178be28e1a…

MALICIOUS

PDF

113.1 KB Created: 2021-05-02 22:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64d20c9923e0f5dcc0c69203a5433069 SHA-1: 9fcb02f3593541a0aa636d1fabebc990b4203408 SHA-256: 3cd29e178be28e1a0f42f752a2460cbe3e417073d58d231508185365a3ea12b0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of the 'utm_term=juno+script+slug' in one of the URLs suggests a potential attempt to track or deliver a script. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be the extensive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=juno+script+slug PDF link annotation
    • https://cdn.sqhk.co/mifigatira/eKggidz/famojapovilef.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/OH7N1gj/wikafuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_605dbd02d5385.pdfIn PDF document text
    • http://workmonster.net/ultimate_dinosaur_simulator_mod_apk_android_1y6ku9.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/ekoGzjf/jarane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_6039cf4ba2170.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/ifKLvIB/notizevus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_600fa4fc95ec8.pdfIn PDF document text
    • http://itabody.space/lulesezopulimur298u.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jeNhggg/spades_rules_for_8_players.pdfIn PDF document text
    • http://autolombardpro.ru/java_swing_grid_layout_spacingz4r09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_1fa9c04e20ff4fe1b48bed77b919d368.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_debc209daaa14a43801880d5223cc09c.pdf?index=trueIn PDF document text
    • http://pemisikozawefa.epizy.com/bch_price_list_july_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/literary_devices_in_romeo_and_juliet_act_3_scene_5.pdfIn PDF document text
    • http://rowezezivifa.epizy.com/lost_books_of_the_bible_free_download.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_4845ace04d4441c5a513107f215ccd97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/tim_ferriss_twitter.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16535 4880 bytes
SHA-256: 6a62efbc52eec9782d6e26f738ddac1e09fbd527e00ab5c77e70e0caecb96575
font_01_sfnt_off000175e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175E1 12428 bytes
SHA-256: 7ef9d1949a5c1a22b2ebaf5e75cdc13c6c541989f4b277213a6e7b1f70f00274
font_02_sfnt_off00019f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F5D 16580 bytes
SHA-256: 2dc47356ff29e52175e602623e15515f02dc3702f590f915ba01124c47919f9a