Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dd0ac62b606961…

MALICIOUS

PDF

74.0 KB Created: 2020-12-22 05:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d19ca27194c3565e55af68db6c43cce SHA-1: 72912a30d0d9fb76d36ca1c6db688314eca369f8 SHA-256: 57dd0ac62b606961c323892ff7fde73e4abf2ac9c03f558d3911c7f7d67ee43e
244 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URLs and the structure of the document suggest an attempt to disguise malicious activity under the guise of information related to small business loans. No scripts were extracted, but the presence of numerous external links points towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=small+business+loans+for+veterans+in+georgia In PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/jorudenatesusa_muxapakomutar_rawimafufukobe.pdfIn PDF document text
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/rulabozugum_vopujeluwike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f920c69ab5d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484821/normal_5fc48d811792c.pdfIn PDF document text
    • https://sowubewakojanit.weebly.com/uploads/1/3/4/3/134348505/5763921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474987/normal_5fcb1756a4667.pdfIn PDF document text
    • https://ribijiwazafi.weebly.com/uploads/1/3/4/8/134881841/pegukawozakonis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fc88af876ecc.pdfIn PDF document text
    • https://toxavikosas.weebly.com/uploads/1/3/4/4/134437834/gowozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1965e5e8e827d4292b594/t/5fc88b358bd7793567542b2a/1606978358043/police_chase_los_angeles_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4e667acac6192ab734fe/1606372967371/83176308768.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc006d0104edf1d777bfbd4/t/5fc18117fa04221c7158abdf/1606517015571/5735507780.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_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 5388 bytes
SHA-256: e2dd1af3d1f8166adb1809c1b8e7d76065225bfce085de944be97aea2b29ed79
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10332 bytes
SHA-256: 0b1ff04a4e9acb4c3b4bd73be189a21a8205ef658294b9afefaccf49785af790

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