Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4f8fceb97c0c0e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 21:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2763eaab40abe9bc32143d884f1894cf SHA-1: daabbc0c7e2d4f23282ed154b38f2d004535324e SHA-256: 3e4f8fceb97c0c0ef84380bd025cde853c6277539e83dedcfdbca7e6076b013b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://xajibur.ru/award?keyword=jurnal+politik+etis+pdf PDF link annotation
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/nalikikajawawiv_vetutite_mepuxuloxeze_wibakab.pdfIn PDF document text
    • http://stavki-na-sport.site/brother_mfc_240c_print_unable_51_errorxcjo9.pdfIn PDF document text
    • http://ar-foto.art/77357042286wi8la.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/83127.pdfIn PDF document text
    • http://accface.in/geometric_sequence_formula_calculatorx0hux.pdfIn PDF document text
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/boboru-mulig-vonujo-momasutujifuv.pdfIn PDF document text
    • http://bitsracing.net/siderafeave0p.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/ragifinun.pdfIn PDF document text
    • https://wesemijotabiwa.weebly.com/uploads/1/3/4/6/134622043/8078027.pdfIn PDF document text
    • http://devlp.club/vuzixivefokol6hh0g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23759e42-5e55-4840-b385-f81fc5c0e87e/63803544791.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_f968cb46903143e79221c3482e4bfe6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66af834-8906-4922-bd2a-ab712c6c8412/80209586189.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_6a63756c64464b7a9db3ad4c4601fbd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c641b2-f6e5-42a1-a2b9-0b9aa6afcada/tirutozetilamefozezozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817c4871-25c2-4c87-a150-e9106086bef0/travels_with_charley_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80762502-4cb5-48e4-bd31-deb37486aa97/bugiwigusosokinedowudala.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/gizag.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/72408534228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1a234a-f698-4e79-823a-542548d242ae/63814816434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9b701d-dd60-4b92-ada3-2bde2f7ed7e7/ejemplos_de_minutas.pdfIn PDF document text
    • https://doi.org/10.21009/JPS.082.03In 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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 5088 bytes
SHA-256: 563ec574a752560ed81290e176b8c2d6b165d661b264fa4e808628eabdc43dd5
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 10692 bytes
SHA-256: 6d15a20659af98842c30a1425cc33d1555f688542f016e1d2bd349c58164e30c