Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c872a72ad3f23bf…

MALICIOUS

PDF

33.9 KB Created: 2020-04-19 04:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9492181b6aee76309bd89e04c4952f2 SHA-1: 775a3c8bc366302789d6b0b8f8f349dbc62e3190 SHA-256: 6c872a72ad3f23bf7b08f300d2d499f9b234ae1683b336e38aface70cd6f1f5e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links likely serve to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, supporting the observed link farm behavior. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

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://rowandesigngroup.net/uploads/1/3/1/6/131606132/131606132.html#ben+10+omniverse+2+wii+free
    • http://recognizerap.com/uploads/1/3/0/6/130622025/17d54670edc102d.pdf
    • http://christiantherapytreatment.com/uploads/1/3/0/5/130539458/suzanere.pdf
    • http://drdavidpeaco.com/uploads/1/3/1/4/131482915/jusemukolafa.pdf
    • http://mobilemechanicsri.com/uploads/1/3/1/4/131413148/4777255.pdf
    • http://maddiemahermakeup.com/uploads/1/3/0/5/130545643/jexoka.pdf
    • http://zackturnermusic.com/uploads/1/3/0/4/130483848/9589003.pdf
    • http://garrettsgunparts.com/uploads/1/3/0/6/130605280/b414da6c.pdf
    • http://nsinx.com/uploads/1/3/1/3/131398350/rijesexe_nubep.pdf
    • http://ulessor.com/uploads/1/3/0/5/130550925/9414224.pdf
    • http://newbranchwellness.com/uploads/1/3/0/3/130313445/3722212.pdf
    • http://celerityrealestate.com/uploads/1/3/0/5/130543837/0bf822e8.pdf
    • http://hr-serious.com/uploads/1/3/0/7/130775015/zivunofoxozuvuberore.pdf
    • http://deardonutman.net/uploads/1/3/0/8/130814681/5c99b957f12046.pdf
    • http://theurbanclimatologist.com/uploads/1/3/0/6/130604541/293a023bf5a18da.pdf
    • http://katiesam.org/uploads/1/3/1/3/131383319/6141123.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_off00005d8b.bin
280490d7872d904356960ae77680104661f2dec312b2493c7ee5d781f599b300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8B 7468 bytes

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