Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7666117a157246…

MALICIOUS

PDF

83.7 KB Created: 2021-02-12 08:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d461d26d8a1ac5fe7a33012b767ada4e SHA-1: 4853fbf364549699c0ca3c39f8b0035145b4c314 SHA-256: 3f7666117a157246c762ef2184bfc51b5558791a2443d469384aa98f82ed7229
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and distributing malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to a Weebly subdomain. ClamAV detection and ML classification confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs suggests an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wb?keyword=advertising%20and%20sales%20promotion%20article%20pdf PDF link annotation
    • https://moxuzoketo.weebly.com/uploads/1/3/1/1/131164531/036c3020a0f6eaa.pdfIn PDF document text
    • http://kosodidaxelo.22web.org/symantec_dlp_15._0_system_maintenance_guide.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/novuj_budipokove_tewalewu.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/gbqhchf/hair_salons_open_near_me.pdfIn PDF document text
    • http://fb-ig-copyright.com/printable_broken_heart_coloring_pagespiykq.pdfIn PDF document text
    • http://8gusevshop.website/story_central_1_macmillant0wk0.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ij6gh66/feruxosigef.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/4435412.pdfIn PDF document text
    • http://luminar3-download.xyz/megamind_movie_rating7zcth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vufupu/valiant_hearts_apk_mod.pdfIn PDF document text
    • http://delifas.epizy.com/webusenolo.pdfIn PDF document text
    • http://dizoduji.rf.gd/lagu_asmara_cover_ines_stafaband.pdfIn PDF document text
    • http://pivutabomenatam.rf.gd/guxiwukewimifidavinidif.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/activity_evidence_of_evolution_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/wejozedaf.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/autumn_leaves_bts_matikiri.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 5524 bytes
SHA-256: 8d281e1c0e32c0624df9fc101b429ec27197ef1bd599534dd39e99c446ddd75b
font_01_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 10412 bytes
SHA-256: fe40513dd424ae29be6f9d9c3ff012e776964dcd97f13b0b21c6cf75e734e9bf

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