Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e2a7128f425ce…

MALICIOUS

PDF

54.3 KB Created: 2020-04-17 10:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8d83e31fbe0d5d0e346d8f6a54deb761 SHA-1: 5285147ca72e6f142145ea5812dec91098255746 SHA-256: 671e2a7128f425cefb438ceb90290bd5831bdaad102c57b7c843d46c27a7b140
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, forming a link farm, and one prominent URL related to 'bootloader unlock apk no root'. The ML classifier strongly indicates maliciousness, and the structure suggests the document is designed to redirect users to external sites for potentially harmful downloads. No scripts were extracted, but the extensive link farm and the nature of the lure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://lykkenkommerindefra.dk/uploads/1/3/0/3/130324119/130324119.html#bootloader+unlock+apk+no+root
    • http://sahilleducatorwriter.com/uploads/1/3/0/6/130621366/3430238.pdf
    • http://janettedmiller.com/uploads/1/3/0/6/130620362/3081675.pdf
    • http://madelinezack.com/uploads/1/3/0/7/130775173/44661d65e867e.pdf
    • http://mysticalrockny.com/uploads/1/3/0/6/130640092/4f2221ed0.pdf
    • http://charlottewildlife.org/uploads/1/3/1/3/131380814/gepexedudedilo_soziluduli_dawenuvuxes_vefiluxirijaxip.pdf
    • http://nuvisionabroad.com/uploads/1/3/0/4/130476691/9e1dd8f0.pdf
    • http://dmasportsgroup.com/uploads/1/3/0/7/130775151/4985484.pdf
    • http://urunis.com/uploads/1/3/1/4/131437364/fonumitesujif.pdf
    • http://mikewilliamslivemusic.com/uploads/1/3/0/4/130488442/269762.pdf
    • http://allfoodsouthern.com/uploads/1/3/0/3/130313113/8831462.pdf
    • http://ccontrerasdesigns.com/uploads/1/3/0/7/130775050/1386197.pdf
    • http://tahoeadventurebikerentals.com/uploads/1/3/0/5/130551143/zogixuvawomive.pdf
    • http://jerremy.net/uploads/1/3/0/4/130436521/bitenuzaviziv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a01f.bin
84455547fdd61f746e277f574e31480d7cbc1011b51cbc896e32de86196f0ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA01F 9036 bytes
font_01_sfnt_off0000c2d5.bin
11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 2768 bytes

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