Malicious PDF — malware analysis report

Static analysis result for SHA-256 3351f46bfffed643…

MALICIOUS

PDF

35.8 KB Created: 2020-05-16 22:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285f25c714c30a1c263f2c87cb431a02 SHA-1: def9242c3cdcb6ebda14919cd9b26d57698bf797 SHA-256: 3351f46bfffed643a00f25537ae3e5aaa3975e5ed981873a6083acea8317081c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'Jammu university ist sem marksheet' and the wkhtmltopdf application, which may be part of a lure to encourage link clicks. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://totalhandymanservice.net/uploads/1/3/0/6/130605422/130605422.html#jammu+university+ist+sem+marksheet
    • http://boominworld.com/uploads/1/3/0/3/130323601/jupol_nafojorogefuf_nudoneju_nupofatekepafaz.pdf
    • http://flyhighleadershipcouncil.com/uploads/1/3/0/5/130539188/498f765861f564.pdf
    • http://maillardreactions.com/uploads/1/3/0/6/130604699/8f29338075.pdf
    • http://sugarfischyteam.com/uploads/1/3/0/7/130738912/sajij.pdf
    • http://cubscouts285.org/uploads/1/3/0/7/130776002/b5d0e8.pdf
    • http://boulderbagel.com/uploads/1/3/0/6/130621908/dewonusexilili_komepefowisozep.pdf
    • http://gardenitup.com/uploads/1/3/0/7/130775651/vojupukamilil-pevumubiril-dokag-zexux.pdf
    • http://oobboo.com/uploads/1/3/1/4/131408224/tupojupuragak.pdf
    • http://jacktopalian.com/uploads/1/3/1/1/131164375/e7909.pdf
    • http://riosfamilyinc.com/uploads/1/3/0/6/130621369/wawew_napuzoketis_sowava.pdf
    • http://jpipkinllc.com/uploads/1/3/1/3/131384383/sovuluzezodi_dubaderalu.pdf
    • http://photosbyjamal.com/uploads/1/3/0/5/130539738/fakutujegi.pdf
    • http://expandwellbeing.com/uploads/1/3/0/4/130489776/9801900.pdf
    • http://360landscapingdesign.com/uploads/1/3/0/6/130605332/3970320.pdf
    • http://freegarageconversions.com/uploads/1/3/0/8/130874391/xovivus_dogotuxexelotu_sukomiguf.pdf
    • http://bmore360.com/uploads/1/3/0/2/130288707/fcd7c71e0.pdf
    • http://alicelovesharps.com/uploads/1/3/0/6/130640123/sonuruzesufap_nosejomeninosa.pdf
    • http://alexandergreentranslations.com/uploads/1/3/0/9/130969206/zavolir.pdf
    • http://sociedadponee.com/uploads/1/3/1/3/131380836/2882514.pdf
    • http://fabstieve.com/uploads/1/3/0/2/130273931/sorod.pdf
    • http://grampacranesfinefoods.com/uploads/1/3/0/5/130551491/5836522.pdf
    • http://stirlingfarmersmarket.com/uploads/1/3/0/2/130270955/wobavo.pdf
    • http://angelawardlaw.com/uploads/1/3/1/3/131382141/6734152.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_off00005f59.bin
d6f3f762858be0e4f009f97e7f443709e094e1fa7336b4980da599f80ac96ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 10408 bytes

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