Malicious PDF — malware analysis report

Static analysis result for SHA-256 d933403a078c015c…

MALICIOUS

PDF

40.3 KB Created: 2020-04-10 01:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6d089e6b0174a14d064b2d8a6c730b2 SHA-1: 758808c10641a4290a784df84259a26816ab293b SHA-256: d933403a078c015c43bded77d9b1f7bb30566c972c6911a7212454bcd3cf7d9d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body mentions 'The fbi career guide pdf', which is likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://expeditionmindsetleadership.com/uploads/1/3/0/6/130639779/130639779.html#the+fbi+career+guide+pdf
    • http://bead-jeweledcreations.com/uploads/1/3/0/6/130620606/3564950.pdf
    • http://shutterque404.com/uploads/1/3/0/6/130620728/tozeroxulikafi-zawabepasizomaw-lenanab.pdf
    • http://ausalon.com/uploads/1/3/0/9/130969001/sasonimegada.pdf
    • http://gilbertbrouillette.com/uploads/1/3/0/3/130323566/724893.pdf
    • http://thomasgeneralcontracting.org/uploads/1/3/1/0/131070124/depedumototulu.pdf
    • http://thenewmathclub.com/uploads/1/3/0/2/130291433/bf009898.pdf
    • http://faroutrocketry.space/uploads/1/3/1/3/131398367/difumaruwefukev-domene-vitizanimab-jogexub.pdf
    • http://menasmenagerie.com/uploads/1/3/1/4/131454733/75e84fce24fdf3.pdf
    • http://chasingthebliss.com/uploads/1/3/1/4/131455680/e2d55324.pdf
    • http://monarchmagic.com/uploads/1/3/0/4/130435551/pafekolatopaz.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_off00007499.bin
5fd44b6d97976733f3b008e71b95e9c1ad820957d6e670f55f7686b322bc60e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 8324 bytes

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