Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fecf4263476fd9a…

MALICIOUS

PDF

37.6 KB Created: 2020-04-08 15:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ec87f86ca66db3644c7195e11a361723 SHA-1: 3a7b64a07e207e003c7e9aa57c514a8135501a3c SHA-256: 1fecf4263476fd9a24638d8f7e9bfbe3206e5d670d2642827664838d95578d72
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jhrpropertyltd.com/uploads/1/3/0/4/130436207/130436207.html#letra+de+caida+libre+conjunto+primavera
    • http://rgsacco.com/uploads/1/3/0/4/130483986/lumavuzavetew.pdf
    • http://littleedenranch.com/uploads/1/3/0/5/130542813/7220857.pdf
    • http://themountsomerton.com/uploads/1/3/1/1/131164295/gidaxizalat_kuwabulivuleduw_vararer_tadenivijoramo.pdf
    • http://azbnk.com/uploads/1/3/0/6/130639449/fipitetutezideg-zumemoseditil-zozon-deferomugamipux.pdf
    • http://mrmanoharan.com/uploads/1/3/0/5/130550796/6604867.pdf
    • http://eastonkclothing.com/uploads/1/3/0/4/130478210/ca2bc93dfeb72db.pdf
    • http://popuppamper.es/uploads/1/3/0/6/130639180/furamopakevuxiras.pdf
    • http://nortegrandeenelmundo.com/uploads/1/3/1/3/131381302/8350326.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc1.bin
3763834b97ec514ca92961bb5720ea9aeb7c3757e0518c88ce9965f680511304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC1 9496 bytes
font_01_sfnt_off00007f9a.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9A 2652 bytes

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