Malicious PDF — malware analysis report

Static analysis result for SHA-256 889b84fc05f3eb01…

MALICIOUS

PDF

76.2 KB Created: 2021-01-12 01:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d3d32b7033cc8cc84afc671b72536df5 SHA-1: 553fbbd404d50da0ddfd488d276616eec726fb9c SHA-256: 889b84fc05f3eb01fbd5f047cffaa5d69c0a8617113b62b1e6433389aa7bbb4a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'traffine.ru'. The document body, though heavily obfuscated, contains references to 'parents guide' and 'wkhtmltopdf', indicating a potential lure for users to click on the embedded malicious links.

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://traffine.ru/123?utm_term=highwaymen+2004+parents+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5f9226e30d448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_5fc223c722934.pdfIn PDF document text
    • https://site-1171784.mozfiles.com/files/1171784/13716055138.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/e2446df82f.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/3243411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fab1a0a6dbe6.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/ce04d802db657f.pdfIn PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/1560107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5ff14490795ea.pdfIn PDF document text
    • https://site-1175818.mozfiles.com/files/1175818/pelulon.pdfIn PDF document text
    • https://wasivexuliji.weebly.com/uploads/1/3/4/2/134236061/3f3ad040186.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/jaxesabi/sezexaguzedodejuxubawijar.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/a_sociedade_e_o_meio_ambiente.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/kawiwenixebasitowafipit.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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 5856 bytes
SHA-256: 4be09e73089058df272132aa44e5480c71cb20b4e4c65da37431334f184298d1
font_01_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 10868 bytes
SHA-256: 874edaac63aa178af8d9f90bf8a5501cdf0cf3c7a68aa61ee074c2e68d5d064b

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