Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33046d26b22949d…

MALICIOUS

PDF

72.2 KB Created: 2021-02-24 06:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a83f5931a3bf39aea03130fde4e7a4e9 SHA-1: 92c73e42894305261c80d3bc12b5649a595b26db SHA-256: d33046d26b22949d3d941ea1525f3cc6f8af9b964c3d0660d967a755f925a6c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs, with one specifically pointing to a URL containing 'wix' and a keyword search term, suggesting a potential phishing or SEO manipulation tactic. The presence of multiple disposable hosting domains further supports the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=mega+bloks+first+builders+ideas PDF link annotation
    • https://cdn.sqhk.co/xuwadezab/tghjdhj/kipufemiwatunafal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_600f39793b00e.pdfIn PDF document text
    • http://xadimilok.iblogger.org/best_browser_for_mi_android_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_6002764a95a79.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/jcigHPY/82083457558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_602fd06386b85.pdfIn PDF document text
    • http://pimadukemaxi.22web.org/66227433373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_601f9348d6bf9.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/hhcge9h/zekenotulatalavekuwofapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxosinuda.rf.gd/nikezirazulomefolap.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/tivafusobaxur.pdfIn PDF document text
    • http://vejawogi.rf.gd/79675173184.pdfIn PDF document text
    • http://tigaxulajaju.epizy.com/norudavojaxexejo.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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 5284 bytes
SHA-256: cd73a32536e59e2bd3176dd6c4ee250349015132e37e476ae6f1abed38012cb4
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10368 bytes
SHA-256: bedbddcaaae29178f4101c4019718a5e44fd4ae86090403a75a1747a8234cd26

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