Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54303c3885613eb…

MALICIOUS

PDF

74.0 KB Created: 2021-02-19 09:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cd5e7097b76b2895178243390668370a SHA-1: 0b53e9e82fe0ebb59e66be76bc76dea268370c96 SHA-256: a54303c3885613eb04fd22fe099ba87e459cf756f6ca5cf6845e175efaaf4baf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=honk+play+script PDF link annotation
    • http://artelamp.store/17882963108m3gd9.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/7630471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_6026627874f34.pdfIn PDF document text
    • https://xekelubapakam.weebly.com/uploads/1/3/4/4/134499273/2085881.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/nejebinuz_pelixeresuril.pdfIn PDF document text
    • https://wojadamizaxit.weebly.com/uploads/1/3/2/6/132681796/da238680925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fe27202360fc.pdfIn PDF document text
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/de391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_5fddd86b24619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_60020adfc5d4b.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/dikotapagesi-larebadu-kebojar.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/dojonuta/situdorazigasonikefefemi.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/saxesodatim.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/45227704249.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/27003935375.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/student_loan_abroad_form.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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 5056 bytes
SHA-256: 69cedbfae306f720d977b874e307a062a9b551b4cb009b854dc55d4eb61a5847
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10772 bytes
SHA-256: 45b754afe3fab8fdfcac2fbcadcc435da738e87a7997854b9d046ab628143a1e

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