Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd3452bf73486a9…

MALICIOUS

PDF

40.5 KB Created: 2020-03-30 16:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e390a95dbfcff652506339d2ef397482 SHA-1: 72f64f34fad8ab458aa87f526e3d6c0ae2a7ed75 SHA-256: 0bd3452bf73486a93eb555d1847f85d1a72902e86b6b7cdd1fcbd84ac3f5b315
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these links, suggesting a coordinated effort to direct users to a link farm. The primary purpose appears to be SEO manipulation or potentially distributing further malicious content via the linked PDFs.

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://foothillsbiblefellowship.com/uploads/1/3/0/5/130550951/130550951.html#definicion+de+principios+y+garantias+procesales
    • http://closetsmile.com/uploads/1/3/0/6/130620367/5719803.pdf
    • http://grrswny.org/uploads/1/3/0/8/130814803/2862741.pdf
    • http://mercedes.fit/uploads/1/3/0/4/130477663/4072476.pdf
    • http://jerrodguillorycomedian.com/uploads/1/3/0/3/130379503/ef04377.pdf
    • http://besthealthandfreedom.com/uploads/1/3/1/3/131380343/wizamobipob-zuwepo-dofidujak.pdf
    • http://firstbookonline.net/uploads/1/3/0/7/130774964/xirazusepaxazo_gazixiz_lepomodovo_putisuv.pdf
    • http://destinedtotravel.org/uploads/1/3/0/2/130291475/masekojejopes-kamadifegotoluj.pdf
    • http://posh-event.com/uploads/1/3/0/7/130739433/6576095.pdf
    • http://the-tv-guy.com/uploads/1/3/1/1/131164152/2934451.pdf
    • http://ns2.grassrootscf.org/uploads/1/3/1/4/131438012/ziwij_bavomujoferulo_zepakorukowo_penokologik.pdf
    • http://goingfurniturerestoration.com/uploads/1/3/0/7/130739470/6509161.pdf
    • http://jeffgraymortgages.com/uploads/1/3/0/5/130544746/vivumopiwow_najejog.pdf
    • http://rockingmfsporthorses.com/uploads/1/3/0/8/130814633/zejinirit.pdf
    • http://mineviewaero.com/uploads/1/3/0/4/130489342/ee512.pdf
    • http://mybattleridgehoa.org/uploads/1/3/0/5/130551270/cc47e3656b3b6.pdf
    • http://mywoodshop.co/uploads/1/3/0/4/130435667/jagodolivuru_kuminij.pdf
    • http://pawprintstogether.com/uploads/1/3/0/2/130289721/zodefawifomake_jozevirufe_desete.pdf
    • http://corinalab.dss.ucdavis.edu/uploads/1/3/0/7/130776015/mazarabigalosopaxozi.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_off0000720f.bin
7f00167ce90539f2c24e4e49b51369b216918a3c7747096499b76c9e4d555a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x720F 9180 bytes