Malicious PDF — malware analysis report

Static analysis result for SHA-256 25477cc4147680d4…

MALICIOUS

PDF

66.6 KB Created: 2020-12-02 00:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ba015e3dd28c05abf2e6f63493a0b6e1 SHA-1: 2ebd985f22e65c570aef6b1427634b92e377b7c0 SHA-256: 25477cc4147680d4d0d340c1ae3048d0ccf49f25c4b08d2c6ac330e7c4a297eb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a lure for phishing or malware distribution. It contains a large number of embedded URLs, including a critical redirector link to 'ggtraff.ru', suggesting an attempt to direct users to malicious infrastructure. The presence of a link farm on disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/aws?utm_term=mathxl+geometry+answers In PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/69db5844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fa42ce500272.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/kozejafijivogux.pdfIn PDF document text
    • https://ronesafoko.weebly.com/uploads/1/3/4/3/134312324/binubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446161/normal_5f9d8f59df174.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/7fd292c.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/liwibufijuvaxenuli.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/5fc0e526c6229360ecacefcf/t/5fc105979ee0f32b8776f8b0/1606485400399/spirit_of_69.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/18095950421.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/34284013633.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_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 5368 bytes
SHA-256: c387504217308c4732c910cdd6c8322ab1af8038c241b6332522fc9a7e8307d2
font_01_sfnt_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 10912 bytes
SHA-256: 5ac5384cc4d89da8f53191803757bfa4fd40e8850d8c7590ae4cfce06c11acba

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