Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b8ecc0e9a08a6e…

MALICIOUS

PDF

40.4 KB Created: 2020-04-12 05:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 28a9f143bd90b775745bc7f3ba19de6f SHA-1: a5f0188b5a2cebf7ecb35054fcebe9f1911bf7d8 SHA-256: d7b8ecc0e9a08a6e2be487511d4fd7ec3aa9dca6d8244600bfe8b277acf556da
96 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 point to other PDFs hosted on various domains. This behavior is indicative of a link farm designed to distribute malicious content. The document body text, though partially corrupted, contains a URL that appears to be a lure for an audiobook, further supporting the social engineering aspect of the attack. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://eshoppy.us/uploads/1/3/0/8/130874368/130874368.html#the+law+of+success+in+16+lessons+audiobook
    • http://yarnsquisher.com/uploads/1/3/0/8/130814011/kidiresesefije_lawapisani.pdf
    • http://sbmobilerepair.com/uploads/1/3/0/4/130488940/3429278.pdf
    • http://dallahousesuites.com/uploads/1/3/0/8/130874388/e0aba184631e.pdf
    • http://frazierdphotography.com/uploads/1/3/1/3/131398258/4068570c47fb0d4.pdf
    • http://excolarchives.com/uploads/1/3/1/3/131382790/lagari-lusito-volemagefunat-gezujifusuzejex.pdf
    • http://poolpatioscreenrepairorlando.com/uploads/1/3/1/6/131607930/7aff126c6206f.pdf
    • http://kenyansinoman.org/uploads/1/3/1/4/131483830/penotikowubep_datug_xewokedupafugav.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_off00007480.bin
c6a434649bd708f69d2cdd92235a8d32d58eb94f423641d2b4a1770a762d75b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7480 8224 bytes

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