Malicious PDF — malware analysis report

Static analysis result for SHA-256 052d1f80a736e39b…

MALICIOUS

PDF

119.9 KB Created: 2021-03-22 08:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ca3657f9c3a106329a046bedbd774ba7 SHA-1: 224d7c9298434950a61f8da1eebc15fce36796cb SHA-256: 052d1f80a736e39b53e98ae7c7a64ea412b1cd5e73d580197d9d19b681b99ce3
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. Heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crophysi.ru/wix?keyword=plants+vs+zombies+mod+apk+2.3.30 In PDF document text
    • http://zevibeponakat.getenjoyment.net/ripejobawometalepexewofet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5ffed442b0445.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/7xjaw2V/baxomotafenifosi.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/gi8OhoA/kaburikam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fefd5843b04e.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/blood_knot_by_athol_fugard.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/12ibhgw/xinikeluxusezaj.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/YzBgcgj/17533797221.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/area_problem_solving_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2e0b8a4cf0ac426f9b3b28dc86804bc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/vugopinebuvupogonafix.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/what_are_the_benefits_of_technical_writing.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_a7dfe8a9a6764d348e24d7b56cf65cc0.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_333bf47b9c36438a96e1b63207a8c0c2.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/47231472182.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_12911c496ae44b04aecea176c2b634f9.pdf?index=trueIn 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_off000195bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195BF 5796 bytes
SHA-256: abe9c2801f09cf01c092f96abaea9a05659ca258d3dffc7b0dad6a4824d70ff3
font_01_sfnt_off0001a97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A97C 12868 bytes
SHA-256: 399a2db4c3253329d2efbf397a3656363dc1bdfc02e0986057cfdf36afad613f

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