Malicious PDF — malware analysis report

Static analysis result for SHA-256 419763d8023fe76f…

MALICIOUS

PDF

73.0 KB Created: 2020-11-17 00:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dce4ad7500aa694fb61f32bde243c9a4 SHA-1: 16defa30b0c429954a1304d0de849425de57488d SHA-256: 419763d8023fe76f5c72ba6f48d4d9a2baab44e135c26209495f50a0a29b8e16
156 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links, likely to distribute more malicious content or for SEO manipulation. The presence of a ClamAV detection and a high ML classifier score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites, possibly as part of a phishing or malware distribution campaign.

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://trafficel.ru/123?utm_term=easyheat+fgs+thermostat+manual PDF link annotation
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://zogetesiwuxiwa.weebly.com/uploads/1/3/4/4/134487963/96001.pdfIn PDF document text
    • https://taneromujek.weebly.com/uploads/1/3/4/6/134611199/kexogoxa.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/a9488.pdfIn PDF document text
    • https://murenazomof.weebly.com/uploads/1/3/4/0/134012525/3314647.pdfIn PDF document text
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/darixov.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/gimufibez-pepufejat-tabok-todemene.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/494dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fa62a22ea369.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/6326712.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/613a3bf392ee7f.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/fibesezati/affidavit_annexure_e.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/caesars_rewards_essential_workers.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/kenmore_80_series_washer_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/dumb_and_dumber_tuxedos_scene.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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 3152 bytes
SHA-256: 96cd6eff552d05f613c76bb665bf839efb2289aefcd6ae6ac465154df43c1569
font_01_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 5240 bytes
SHA-256: c7b4247606f4f28c80bdc443ea4504f9236175ba5a90653ca290bb0b038f856a
font_02_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 11868 bytes
SHA-256: 565a8756f0555db9586afd2dd15fbd1e80e744d9504a01335db232d3799a6553

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