Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bbd452d828056f…

MALICIOUS

PDF

45.6 KB Created: 2020-03-14 19:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3a115660d6d93ed7a5cbdeb13d4670e2 SHA-1: 3e1249c58e49647333a7975f65fe51a4fa35f892 SHA-256: 57bbd452d828056fb08512765b5d846c4a624283fc9d3c43552ee7748b3debb4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, references 'Crusader of light beginner guide' and includes URLs that are likely part of a phishing or malware distribution scheme.

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://cldqe.bpmtc.com/uploads/1/3/0/4/130483852/130483852.html#crusader+of+light+beginner+guide
    • http://www.twathletics.com/uploads/1/3/0/6/130621119/5516375.pdf
    • http://agan.vip/uploads/1/3/0/4/130483355/vozugekelaw.pdf
    • http://patelchiro.com/uploads/1/3/0/4/130435884/3789711.pdf
    • http://hostmaster.sparkliciousliving.co.uk/uploads/1/3/0/5/130588716/7089661.pdf
    • http://mail.orovalley.org/uploads/1/3/0/8/130873953/xunej.pdf
    • http://learninglandexpress.com/uploads/1/3/0/7/130739810/2450132.pdf
    • http://www.conincamden.com/uploads/1/3/0/5/130589231/3038081.pdf
    • http://m.midwivesadvantage.com/uploads/1/3/0/6/130604531/b768c80c10664b.pdf
    • http://mcpowercleanltd.com/uploads/1/3/0/6/130621666/f33bd.pdf
    • http://lulusclassicvintage.com/uploads/1/3/0/7/130740051/bilesitojimawoj_patizipub_silukarijadaguj.pdf
    • http://www.jesseeandrews.com/uploads/1/3/0/5/130543373/198904.pdf
    • http://yigga.com/uploads/1/3/0/2/130271154/xusumogu.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_off00008978.bin
4e4dcc96f730ac55aecb91562a21670a6a63aa95f2c13d27e69b2986e2f9a6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8978 7856 bytes

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