Malicious PDF — malware analysis report

Static analysis result for SHA-256 4241729b2581010e…

MALICIOUS

PDF

39.9 KB Created: 2020-04-04 15:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed55c842ff6cd300da52bc7a9ab0c1bc SHA-1: 2677916367c4f1f7bd5d30184c73f093a4579b32 SHA-256: 4241729b2581010e36fe0b6f3bf935d307aa6fa9200f9dc753d948156f2adc4f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or SEO manipulation tactic, likely intended to drive traffic or distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact payload.

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://grupojaziel.com/uploads/1/3/0/7/130776699/130776699.html#en+que+consiste+la+domesticacion+de+animales+y+plantas
    • http://bitcoinserv.co.uk/uploads/1/3/0/7/130775186/b4aa873.pdf
    • http://jeremymichaelstone.com/uploads/1/3/0/7/130776898/6542735.pdf
    • http://reelnativefishing.com/uploads/1/3/0/6/130603955/xijowonidififu_xokugedaratux.pdf
    • http://bornforbooks.com/uploads/1/3/0/7/130775286/xibifud.pdf
    • http://cristofori.online/uploads/1/3/0/6/130605001/puwemepiwepixa_fozavuj_biwajibenites.pdf
    • http://youbyou.kiwi/uploads/1/3/1/1/131164095/6770046.pdf
    • http://poolguyzenmaster.com/uploads/1/3/1/0/131070481/fosabed.pdf
    • http://dandiliongarden.com/uploads/1/3/0/5/130542908/7eb736e1caa2bb4.pdf
    • http://weimakleiner.com/uploads/1/3/0/7/130775263/d57a689aa5.pdf
    • http://thesunriseclothing.com/uploads/1/3/0/6/130604036/vebeloxu.pdf
    • http://valleybikecommute.com/uploads/1/3/1/4/131438579/6656291.pdf
    • http://thefashionablefarmgirl.com/uploads/1/3/1/3/131384185/zupivezidoj_kogokupabex.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_off000070d6.bin
58c3a446fcfd82e3fb7ef72d24c4188dd28ce3fe6ef0c1e9fdbe9ddd5f70decb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D6 8740 bytes

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