Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c5c77acb91ebc6…

MALICIOUS

PDF

78.8 KB Created: 2021-06-04 10:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5f81c82a044dffeca64165084c218753 SHA-1: d966145b237d4839e58fa80e1823039e6382d21d SHA-256: a0c5c77acb91ebc6b3ea0cd81662db2965e36cc17bf8aa5a7e5cbe5a55f78455
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the numerous external links suggest a multi-stage attack or a content-luring mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=what+is+the+negative+tu+command+of+hacer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415537/normal_6052e1ad42a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_604ccbaf2cc72.pdfIn PDF document text
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/zobedaxuvis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404512/normal_6003ab4c7cb99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_601a62e3cad53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_60013a2a46113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_605571a973a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_6066481418c25.pdfIn PDF document text
    • https://wemedasexokava.weebly.com/uploads/1/3/4/5/134512162/901f3621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5fcea44777358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_6012589413931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_601cdd6233c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_6038233f28829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144450528/anime_all_stars_mugen_apk.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144540117/download_the_fever_code_indonesia.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/41928465611.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/477570224.pdfIn PDF document text
    • http://likanegi.pbworks.com/w/file/fetch/144602880/58294032508.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/how_to_adjust_accelerator_pedal_position_sensor.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/91366567689.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144451098/business_statistics_mcqs_multiple_choice_questions_and_answers_arshad_iqbal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 5356 bytes
SHA-256: 186b42f2ebbf3fe3b67f69e2e83894d21325203ccb9a9f36f96d38cbddb79f0f
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 11512 bytes
SHA-256: 775358e1fb1375dbad55dc2784d83a208240796d8150a7b2d0f60fa94cc4dfa9
font_02_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3