Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3eff92fdb5d592…

MALICIOUS

PDF

48.6 KB Created: 2020-06-09 00:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30b8900b318fbd0d676442cd03709f9d SHA-1: 9c7310a38285edd009a675edf572dfe387f8798e SHA-256: bf3eff92fdb5d59260d51cb331a05798d4b2d34ccc681f5475a65062b7849a30
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to diagrams and percentages, suggesting a lure. The primary purpose appears to be directing users to a network of linked websites, likely for SEO manipulation or to serve as a landing page for further malicious activity.

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://eng.hnaconsult.com/uploads/1/3/1/3/131398291/131398291.html#diagramme+circulaire+pourcentage+en+degr%25C3%25A9
    • http://hokeypokebar.com/uploads/1/3/1/1/131164043/kajire.pdf
    • http://webmail.wepitchin.com/uploads/1/3/1/3/131381963/movajap_sopivobazun.pdf
    • http://mlces.com/uploads/1/3/1/1/131164375/44d834.pdf
    • http://dmitrithompson.com/uploads/1/3/1/4/131455883/fanuze.pdf
    • http://4x4toursaustralia.com/uploads/1/3/0/5/130551656/2046941.pdf
    • http://hostmaster.beautechnique.com/uploads/1/3/0/4/130476079/zovukobarejawuxumono.pdf
    • http://mohawkriverstore.com/uploads/1/3/0/3/130313183/fudomupedugi_pojamemiwomakon.pdf
    • http://oberlin-family-dental.com/uploads/1/3/0/6/130621959/jugixirube-sisopefunazoxad-xeguwaz-wagidibemaja.pdf
    • http://mx.rightandleft.net/uploads/1/3/0/4/130476503/gawufopetopiwida.pdf
    • https://gimasesagix.files.wordpress.com/2020/06/gupopirevipozovojiwesiwon.pdf
    • https://zifenopi.files.wordpress.com/2020/06/xepabemajuj.pdf
    • https://kiwuzuk.files.wordpress.com/2020/06/xinaxubajikofijobo.pdf
    • https://zufarosivalu.files.wordpress.com/2020/06/30380719041.pdf
    • https://jurajagu.files.wordpress.com/2020/06/zikekilepixoti.pdf
    • https://fibawulox.files.wordpress.com/2020/06/ladarejizebanijedoru.pdf
    • https://lalujopej.files.wordpress.com/2020/06/fevisinumanimupunoja.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_off000087fe.bin
8c309d61c8048d26d1378308fbd216a4b225c9a210e961f84e9ae9a7737254c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FE 14080 bytes

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