Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49bc4d8f7b29991…

MALICIOUS

PDF

44.0 KB Created: 2020-05-04 00:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34e98c12ade13b07c2469915aa2d0625 SHA-1: fbb4f74d4192a817ca333b5b8d15f1351fd5a058 SHA-256: e49bc4d8f7b299915d023bf519745bcac03253319da38f190a8da2ca60f95c78
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 similarly structured URLs on various domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains references to file formats and Excel, suggesting a lure to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://asociacionperiodistaspr.org/uploads/1/3/1/8/131856887/131856887.html#file+format+in+excel+definition
    • http://layalarabikatbi.com/uploads/1/3/0/7/130739023/tuzojagijifolimaka.pdf
    • http://koalaphone.org/uploads/1/3/1/3/131381101/biribuduxinevix.pdf
    • http://tytheringtonfamilyfun.com/uploads/1/3/1/4/131437130/3064345.pdf
    • http://vishuddi.com/uploads/1/3/1/4/131438397/rakirizawo-lotudujulemam-muzagurut-peroxazinedomo.pdf
    • http://tmjcenterhawaii.com/uploads/1/3/1/0/131070149/e87b6c5558b.pdf
    • http://pittosporumgolfball.com/uploads/1/3/0/6/130621321/bad1aa57f3cd0.pdf
    • http://eatfyb.com/uploads/1/3/0/2/130289741/8379051.pdf
    • http://manchestersoap.com/uploads/1/3/0/7/130739366/c0cdc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00008169.bin
dde719cb18c596aa172ec87d8c5ea391f08d32fa73fc0c92869c561e51cab310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8169 10708 bytes

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