Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7864750b28b944…

MALICIOUS

PDF

71.3 KB Created: 2021-01-10 02:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6a7d386283d138c2b0c6642b63f73f5d SHA-1: 0b8857aef2808892283bd8fae2825e914436ae45 SHA-256: 4a7864750b28b94400807625b9c06ebc64938d712520a461a3fc46931e993790
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with 26 distinct links found. One of these links, https://traffmen.ru/aws?utm_term=adobe+illustrator+book+templates+free, points to known malicious redirector infrastructure. The majority of the links lead to disposable hosting, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=adobe+illustrator+book+templates+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5faf654cdbe8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f9d7925dae0e.pdfIn PDF document text
    • https://site-1172627.mozfiles.com/files/1172627/28315642552.pdfIn PDF document text
    • https://site-1168441.mozfiles.com/files/1168441/reguraferefesujuvanabipix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8b8f7569ee0.pdfIn PDF document text
    • https://site-1174676.mozfiles.com/files/1174676/winter_driving_cartoon_pictures.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/postal_police_officer_salary_nyc.pdfIn PDF document text
    • https://site-1171454.mozfiles.com/files/1171454/steel_plate_weight_calculator_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5f98a941ddccc.pdfIn PDF document text
    • https://site-1171564.mozfiles.com/files/1171564/italian_pepper_steak_recipe.pdfIn PDF document text
    • https://site-1176323.mozfiles.com/files/1176323/mediaf_re_minecraft_bedrock_edition_pc.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/lemixap.pdfIn PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/que_es_un_analisis_dimensional.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 5380 bytes
SHA-256: b19c540d0d83d56bade96b948e798e4f7fe1b4d6bdf93ec780cc670938be5bcc
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 10332 bytes
SHA-256: f473a31005b2063ec0f690929f00d6f0e725f2506001bc85bd863dc65b1d44bb

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