Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80860b5d80d5365…

MALICIOUS

PDF

40.8 KB Created: 2020-03-21 14:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c226d55c157b911fc8b3367c2a726cb SHA-1: 5d25b5f3a8a4e6c7f1c6c8e364cb72b1b3348baf SHA-256: a80860b5d80d5365586372d0a1a9ceb205e8f890b5e0c1837e8cca89dbfeb38d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains URLs that are part of this link farm. This suggests the primary purpose is to direct users to a network of websites, likely for SEO manipulation or to serve further malicious content.

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://secure-pof.com/uploads/1/3/0/2/130289244/130289244.html#lenguaje+literario+ejemplos+poemas
    • http://www.myimages.biz/uploads/1/3/0/6/130621814/xeguxavemibomi.pdf
    • http://smarthinkhub.org/uploads/1/3/0/2/130289478/998676.pdf
    • http://jaimeeann.com/uploads/1/3/0/8/130873976/rujidor_difepixad_litejebigatebog_mitudexo.pdf
    • http://laitronics.com/uploads/1/3/0/5/130550956/mulama.pdf
    • http://cpanel.carolynforonda.com/uploads/1/3/0/6/130621772/gapog.pdf
    • http://commerical-analytics.com/uploads/1/3/0/5/130589399/meberaw.pdf
    • http://peterweiden.com/uploads/1/3/0/2/130273798/9805087.pdf
    • http://hwap.me/uploads/1/3/0/4/130483903/pufifunafebafi.pdf
    • http://www.organizingforearlychildhood.com/uploads/1/3/0/5/130539155/6314079.pdf
    • http://spiritstrongfitnessstudio.com/uploads/1/3/0/7/130776661/jituzejepijomupib.pdf
    • http://youthandcollegeministry.dioceseofquincy.org/uploads/1/3/0/8/130813888/2ee439b1.pdf
    • http://ucfrugby.org/uploads/1/3/0/7/130740054/danirutamoli_dodimiki_biratiw_nirojiruwilije.pdf
    • http://ninoalvarez.biz/uploads/1/3/0/9/130969281/655703.pdf
    • http://www.indiagvalentin.com/uploads/1/3/0/9/130969702/japabivisemobupu.pdf
    • http://www.ocstuffstore.com/uploads/1/3/0/5/130540211/xofuvizopejeger.pdf
    • http://latribudelcolce.com/uploads/1/3/0/5/130539584/8368807.pdf
    • http://www.pcs-ddd.co.uk/uploads/1/3/1/1/131163505/539bd.pdf
    • http://bcvailvacation.com/uploads/1/3/0/7/130739192/kesoju.pdf
    • http://djsanddy.com/uploads/1/3/0/9/130969057/4fb16aca8792.pdf
    • http://staplesroofplumbingservices.com/uploads/1/3/0/5/130589295/dosoludoluje-rogasakiworuwof-kijetepibevo-gukovegejuwomuz.pdf
    • http://www.cartoonsbysarah.com/uploads/1/3/0/9/130969195/8802c11cc183f25.pdf
    • http://5-aas.com/uploads/1/3/0/6/130605113/9709768.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_off0000767c.bin
1bcdaf194186e80fc4333d76957e4ce251bdc8477ce030140959fdb4a22d5657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767C 8080 bytes

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