Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc846a66e180047…

MALICIOUS

PDF

77.6 KB Created: 2020-12-06 00:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cc8a07c960ce68864a4b61c889ab08a0 SHA-1: 7fa8551765f39011b20060134665a0a457b814ee SHA-256: 4fc846a66e180047314b0f38a3ea91ba316c40e155f6346802180d9f08ebd3a8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier further support its malicious nature. The primary malicious URL identified is 'https://traffmen.ru/123?utm_term=bissell+powerforce+compact+bagless+vacuum+2112+%2528new+version+of+1520%2529+filter', which likely serves as a redirector to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=bissell+powerforce+compact+bagless+vacuum+2112+%2528new+version+of+1520%2529+filter In PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/godexepofop.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/nivelewetobodaj-nigivawo-zenuzikogunapa.pdfIn PDF document text
    • https://kafakekamiv.weebly.com/uploads/1/3/4/6/134646951/salexonebuda.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/vamatebumaviwaxowenu.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/7806506.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.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
    • https://s3.amazonaws.com/sikuva/introduction_to_sociology_ninth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e3d31c-f939-46b6-ba3d-cacbf7709075/lisomowoguma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d97e258-6941-4b2e-961e-2486c2c365aa/neguboxupodepiliva.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/milisedemujenetiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be4e9cc-1f31-4c23-9c85-2a6d10b52186/20_questions_jehovahs_witnesses_cannot_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8201dcbc-dab2-43d3-bbdf-1db7313adbdf/chapter_3_molecules_of_life_worksheet_answers.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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 6160 bytes
SHA-256: b4e79db9952e56dd82ed094d7f69657607cb5b7932f707dd5f28db0d6555e7d4
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 10564 bytes
SHA-256: 8f3e877682ec781d4a9d55d0f6cd88dc31f5e9e6d818ec10c4c97bb01670b119
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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