Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb29b4cf129a07…

MALICIOUS

PDF

44.1 KB Created: 2020-03-15 06:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 514010682d7873271ad28d7f314aed37 SHA-1: 635be4e2fe62cde4fb25079b92f0f3b3660ba068 SHA-256: 71bb29b4cf129a07350d2ce0068a43f6fbc79d57f566a5a948cd888398d34849
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to redirect users to potentially harmful websites or to distribute further malware.

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://ttmusb.com/uploads/1/3/0/6/130639703/130639703.html#divorce+affidavit+template+australia
    • http://bingscatering.net/uploads/1/3/0/6/130604522/pozutib.pdf
    • http://vontofficial.com/uploads/1/3/0/5/130542875/6255754.pdf
    • http://castervaria.org/uploads/1/3/0/2/130271237/punaluv.pdf
    • http://littleweedsworkshop.com/uploads/1/3/0/7/130775983/613955ecf3.pdf
    • http://www.totally-normal.com/uploads/1/3/0/4/130435748/bevukakuwo.pdf
    • http://thecynicalsage.com/uploads/1/3/0/5/130589036/e2f5b2f0.pdf
    • http://mahtehkitchen.com/uploads/1/3/0/5/130590177/2165271.pdf
    • http://www.lightningextinc.com/uploads/1/3/0/4/130483566/3745251.pdf
    • http://biweeklydealeramerica.com/uploads/1/3/0/6/130605015/tizedudaf-rabadazowinuse-boruxidibot-vomusobomara.pdf
    • http://frisco-auto-detailing.com/uploads/1/3/0/6/130639333/8193393.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_off00007f6e.bin
f69dd1e5164794509c8b20d693ed25f4df73dd032cc52fb78e671d1ede466124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6E 9064 bytes

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