Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a69f675e0bf3971…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 07:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7988ea9318eaa352d1891cd1b0f9e7b6 SHA-1: d7259d393bb82320ac8ac5901b76168beeb71d26 SHA-256: 1a69f675e0bf3971f760ed7f91eeca69f5f1b12cce31834eb72d129065f4f082
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/wix?keyword=nine+pointed+star+images PDF link annotation
    • https://cdn.sqhk.co/mozigizax/hcRijNa/gisunajosabifidijizufa.pdfIn PDF document text
    • http://somukegizos.66ghz.com/videlenakurix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_601976ec0858b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/SifBiaj/flashlight_gloves_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/x4WidH1/46713860813.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/4H7qMjb/supewumiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_601c626ed5f86.pdfIn PDF document text
    • http://tusapet.iblogger.org/10442218949.pdfIn PDF document text
    • http://worodariravo.22web.org/sajovurofuvujofalofe.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/rgjMzd3/fancy_nancy_theme_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368732/normal_5fed2d4b220fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_606541419e3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fed7c4348391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_604412ad539b9.pdfIn PDF document text
    • http://sabinemusewak.22web.org/bisegofop.pdfIn PDF document text
    • http://satofaxa.iblogger.org/89094263001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_606558fe3a9c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mexadup.rf.gd/advantages_and_disadvantages_of_internet_for_students.pdfIn PDF document text
    • http://nanolato.rf.gd/kozekesapinutesololanowiv.pdfIn PDF document text
    • http://papemekibe.rf.gd/electro_pneumatic_rotary_positioner.pdfIn PDF document text
    • http://tumofif.rf.gd/91784955615.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/xukonudow.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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 5216 bytes
SHA-256: 506ea2852f4dc687c80b6f7f16dcfdf6171f6eb70a78bfed1f7c44809737aa52
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 11056 bytes
SHA-256: 477043d3c8a2127d8ff5e9d88177d47f125ceeb04f3f6d6a23bb1d32ddc0eb41

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