Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daa5cce86555281…

MALICIOUS

PDF

40.1 KB Created: 2020-04-08 06:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db1ce1aa151b268d008e0b16d074e5d6 SHA-1: 310b1608d7dee129910e28377f1fa65a7a4c8cf9 SHA-256: 7daa5cce865552818877c1cab987c8e2df355ca6c60fa4dffa9774bb037f62df
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these numerous external links, which could lead to further malicious content or exploitation.

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://beeidentification.com/uploads/1/3/1/0/131070073/131070073.html#cuidados+de+enfermeria+en+pacientes+con+ictericia+neonatal
    • http://sprzataniewspolnot-warszawa.pl/uploads/1/3/0/3/130379509/a87bbb55c34e0.pdf
    • http://surtienvasesneiva.com/uploads/1/3/0/4/130435649/5ddc0ebf.pdf
    • http://abgardeningservices.com/uploads/1/3/0/5/130589297/lasagixu_potolebiro_zibuzakuxufakob.pdf
    • http://fabian-ng.com/uploads/1/3/0/6/130621719/gulakowelo.pdf
    • http://pickmylotto.com/uploads/1/3/0/9/130969683/2738517.pdf
    • http://stdio.xyz/uploads/1/3/1/4/131406115/f928e8c.pdf
    • http://cancunmodels.com/uploads/1/3/0/6/130639503/wikikuzaworu.pdf
    • http://gracewesleyanmartinsburgwv.org/uploads/1/3/0/8/130813897/defidukala-ximojosavoliwot-kidovewonut-bilemov.pdf
    • http://itsmeaudrey.com/uploads/1/3/0/4/130488123/vevijib.pdf
    • http://sharisirkinco.com/uploads/1/3/0/7/130776514/7879577.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_off000072ba.bin
55781e6989b4a7a8b406e161bdb1345b79f730610389e3ac4957be87c0319ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 9064 bytes

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