Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb862c6263b3b42…

MALICIOUS

PDF

62.3 KB Created: 2021-01-01 13:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 707e037d1afe02f13f2940959e3cd0e2 SHA-1: 79a0d5e9e8db37a0d8503314d96ed01060691c8a SHA-256: fcb862c6263b3b42ebf36b5140717299797d545a0261ef5fdc110791e93bf25c
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to external PDF files hosted on disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL redirects to known malicious infrastructure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm the malicious nature of the file, classifying it as a phishing trojan. The primary function appears to be acting as a link farm, likely for SEO manipulation or to distribute further malicious content.

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
  • 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=apk+card+wars+adventure+time In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5f9eaf98aaead.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/6539078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_5fae3ba64c344.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/zjd9zrg/build_it_green_nyc_astoria.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/birutijur_rogewewevifori_faxuniwexab_telukitojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5fc08db5e8614.pdfIn PDF document text
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/4bba0e0088.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/gcugeGx/magnetic_chess_set_near_me.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/sunokimejebiku_kigipukuvo_govosetelad.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/ee8ea07f059.pdfIn PDF document text
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/60bdf5438767.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/ragejufa/84951773080.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_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 5392 bytes
SHA-256: 19986ec99824fb0e4c4a9d3ec8597fbc3f90042545c5cc0b1b27c208f00da35f
font_01_sfnt_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 9964 bytes
SHA-256: 732965b37555e51cd93cfd790f2d5f209882fad9d1003bb238c2b2124e83aa5b

Open this report in the interactive analyzer, or submit your own file for analysis.