Malicious PDF — malware analysis report

Static analysis result for SHA-256 151afb9f39c52260…

MALICIOUS

PDF

40.4 KB Created: 2020-03-29 04:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15833f7e2582a660386a4144ca47d045 SHA-1: 53e3a9cb88f53754a9f3471aa31d9794a765f239 SHA-256: 151afb9f39c52260ef6b289edb49d9c0c4b254a339168a7446f815b3f3cfcfeb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to SEO spam pages or potentially host further malicious content, aiming to direct traffic away from the document's apparent purpose.

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://hotelvic-phase2-ja.devsite-1.com/uploads/1/3/0/6/130621918/130621918.html#apa+style+independent+samples+t+test
    • http://enggalliance.org/uploads/1/3/1/3/131383456/wunekeni_ponifi_pegate_kakonigowit.pdf
    • http://number120designs.com/uploads/1/3/0/2/130289453/tumetapuwevaz.pdf
    • http://topdaves.com/uploads/1/3/0/3/130324063/nisusamipim_zasafir_ralotek_xenelajumoja.pdf
    • http://mshvita.com/uploads/1/3/0/6/130639966/b01c1a.pdf
    • http://mystical-mesquite.com/uploads/1/3/0/5/130588961/7882471.pdf
    • http://holliwoodsound.com/uploads/1/3/0/5/130589090/vubowa.pdf
    • http://www.thepeoplesjunction.com/uploads/1/3/0/3/130324207/57526.pdf
    • http://masstechlaw.net/uploads/1/3/0/6/130621048/b1225df30a7e0c7.pdf
    • http://4hwesternheritageproject.org/uploads/1/3/0/6/130620173/bixetiz.pdf
    • http://urbanwildparent.com/uploads/1/3/0/3/130379271/5089039.pdf
    • http://www.iltuositoinprimapagina.it/uploads/1/3/0/8/130874015/6628684.pdf
    • http://curtiscourtney.com/uploads/1/3/0/2/130291724/vizekof.pdf
    • http://bieullg.sites.logojoy.com/uploads/1/3/0/6/130604191/245293ec60cba4.pdf
    • http://www.summitneuropsych.net/uploads/1/3/0/5/130541077/5460632.pdf
    • http://bjpartyrentals.com/uploads/1/3/0/7/130776421/xadegamipedo.pdf
    • http://ithlp.dk/uploads/1/3/0/4/130477533/5713096.pdf
    • http://mikeintucson.com/uploads/1/3/0/4/130491179/kobosujibekapif_gejilakararubeg_bovawanuw.pdf
    • http://torbertsorangecorn.com/uploads/1/3/0/6/130621148/8d42ab567eea131.pdf
    • http://beltwayig.com/uploads/1/3/0/4/130490643/2528082.pdf
    • http://bluefinmiddletonma.com/uploads/1/3/0/7/130740318/81decdc.pdf
    • http://www.shaynasander.com/uploads/1/3/0/6/130620985/revekibagolodizajen.pdf
    • http://hazluxvip.com/uploads/1/3/0/2/130271184/xasatixikafege.pdf
    • http://atxbeers.com/uploads/1/3/0/6/130621832/birinibadatilam-zujevodega-nujodojorikad-dibig.pdf
    • http://ffanimalfoundation.org/uploads/1/3/0/2/130287878/nafovidegu.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_off0000754c.bin
3f2955b4e6c3b9bf91c6abe4c58dca70ead31a98717094a06848fdecc8176bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754C 7940 bytes

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