Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a752c3b10ee0871…

MALICIOUS

PDF

87.4 KB Created: 2021-03-06 02:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31d0a1d1e84e1925dbbec79196cee48b SHA-1: 1e2e203d1abd2c630f226f3ff8510dddadba89a0 SHA-256: 4a752c3b10ee08712c41cadebdd3dc738b2d3d2f41fe7f4b21050f3925aac971
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, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary IOCs are the numerous URLs embedded within the document, which are designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=la+m%25C3%25A1scara+de+la+muerte+roja+resumen+corto PDF link annotation
    • http://zoneeuro.pro/99716907055dx6sw.pdfIn PDF document text
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/davituvosud.pdfIn PDF document text
    • https://burusezal.weebly.com/uploads/1/3/5/3/135306482/mofera-vokaji-banidazepixeb.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/d2308093e602ddd.pdfIn PDF document text
    • https://ronafipilegov.weebly.com/uploads/1/3/2/6/132681204/gejiragodilek.pdfIn PDF document text
    • https://musonilemif.weebly.com/uploads/1/3/4/7/134752032/289c468dc06f02e.pdfIn PDF document text
    • http://betmoy57.com/skin_editor_for_minecraft_apkuk9jw.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/07221ca5ed.pdfIn PDF document text
    • http://ionatr.space/26085695507olw0x.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/fosumubofesatinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_75124300a60e45b6b5a1205bf8a2833f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5332b8a-ea3c-4dcf-96f5-3707f9065c8a/robeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965f6842-5323-4ad7-9309-e14c26977b15/79411125561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9633380-0280-4f61-8292-2194577d8a07/jeep_wrangler_workshop_manual.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_b048cdb6e16c4bdb9bc2e20aaaaf5a3b.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_32f74365bb9e4960a4f8705b436ae744.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebb8c88-d8ed-43b2-8338-3c5ee2576867/kaxozivadowowuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de796095-e266-4d06-89e4-ed3ccce39cf2/duzotanozepubejokenob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c9d769-6377-488e-909e-b2f5356df82d/9384492305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8c6779-86d5-41ae-91de-9b31a6c2e959/how_to_configure_hikvision_dvr_nvr_ddns_remote_view_setup_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f5c966-4f8d-41da-9b28-e2aba5b1c3a5/how_to_fix_call_forwarding_on_samsung.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_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 5336 bytes
SHA-256: 54fa9475fe12b161626f25d290b5ec163040a1ea8785afe46f4c93b38f2b65e4
font_01_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 11412 bytes
SHA-256: 1ffac6c5ae60c6d58f70844f8a86966dbf30d1832ada704bcd591e88de124dc8