Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6b485a4391b046…

MALICIOUS

PDF

52.6 KB Created: 2020-06-11 18:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f96427d1dfc5b5b953211b6c265f9235 SHA-1: cc3b658fed77662cbe5493cc98306876c2113c25 SHA-256: fd6b485a4391b0462fddf16d0f39c4668a401ccba0f76411c9d7a14777954bea
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are structured as SEO-optimized PDF lures. The document body, though heavily obfuscated, contains references to 'Epia-m motherboard manual' and the authoring application 'wkhtmltopdf', suggesting a deceptive pretext. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown-reputation URLs indicates a high likelihood of a malicious distribution campaign.

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://millennial-media.net/uploads/1/3/0/7/130739479/130739479.html#epia-m+motherboard+manual
    • http://mail.koezle.ch/uploads/1/3/0/5/130542968/ea25353a8c5123.pdf
    • http://thirdcoastvisuals.com/uploads/1/3/0/6/130621789/ruditonera-manifokaxi-kotewoz.pdf
    • http://mx.grandmacs.org/uploads/1/3/0/4/130478470/d42eaf4fc82.pdf
    • http://casachicofficial.com/uploads/1/3/0/8/130813730/sipisez_ranobozovabibe_zipaj.pdf
    • http://eaglespiritacademy.com/uploads/1/3/0/6/130621582/jazexuvinekodo-vanidepepi.pdf
    • http://blessed2cphotography.com/uploads/1/3/1/4/131437116/1343357.pdf
    • http://theorchar.com/uploads/1/3/1/6/131636826/1f509.pdf
    • http://elliebellyphotography.com/uploads/1/3/0/4/130476060/mavulo.pdf
    • http://insureplexagency.com/uploads/1/3/0/8/130813730/bubotesiporo.pdf
    • https://mozovigi.files.wordpress.com/2020/06/48604642492.pdf
    • https://pirotevo.files.wordpress.com/2020/06/88947631448.pdf
    • https://sisafuwit.files.wordpress.com/2020/06/74843075698.pdf
    • https://razekezal.files.wordpress.com/2020/06/kavolupevasomixi.pdf
    • https://zaguzewurufo.files.wordpress.com/2020/06/gedigepiwo.pdf
    • https://denorawe.files.wordpress.com/2020/06/63985566128.pdf
    • https://detezunugola.files.wordpress.com/2020/06/miwunuwofo.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bf3.bin
a40a64c3e7e44f7de0a1a4c0cce4f8976143eba6b6ba6afb105e968e4c2a88fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF3 12772 bytes

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