Malicious PDF — malware analysis report

Static analysis result for SHA-256 904894f0ea8b2fc6…

MALICIOUS

PDF

24.8 KB Created: 2020-04-13 02:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb9aca9a0c4edc5c444a474790636b24 SHA-1: d3fdff22914fcfa7f5ce0527eac25306d22893bc SHA-256: 904894f0ea8b2fc69e58c4b5f2718aad6e6e96b68941d716c56660fda6ba5580
114 Risk Score

Malware Insights

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

The PDF is identified as a malicious image-only lure, typical of phishing campaigns. It contains numerous external links, with the primary one pointing to 'http://alexpabst.com/uploads/1/3/1/4/131454316/131454316.html#engineering+mechanics+statics+13th+edition+chapter+9+solutions+pdf'. This suggests the document's purpose is to redirect users to a potentially malicious website. The ML classifier strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 24 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://alexpabst.com/uploads/1/3/1/4/131454316/131454316.html#engineering+mechanics+statics+13th+edition+chapter+9+solutions+pdf
    • http://laurabarclay9.com/uploads/1/3/0/7/130739158/4156650.pdf
    • http://sangatcentrodeyoga.com/uploads/1/3/0/2/130270996/8601952.pdf
    • http://cbenedict.com/uploads/1/3/0/4/130476327/vategukusadolu.pdf
    • http://iammyowntwin.com/uploads/1/3/0/7/130776517/0d723a9d.pdf
    • http://remoteoilwellsolutions.com/uploads/1/3/0/6/130621698/zerelafizubonebu.pdf
    • http://olyrartcreations.com/uploads/1/3/0/6/130621937/23c8ba4577f5f.pdf
    • http://sugarriverfloors.com/uploads/1/3/0/6/130639700/fadefuzolo.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_off00004158.bin
37ea84062ea19a83fa943803d7d9dd776d8114d3a5b1cde6cbf5cae9d4e2839a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4158 5300 bytes

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