Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bd516ac107d44d…

MALICIOUS

PDF

40.0 KB Created: 2020-05-25 17:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6b36aa956927f8ba54c6daf276e3ea SHA-1: 112bde198769a5fb23f2b39abc26b23b1a4f9b78 SHA-256: a5bd516ac107d44d5315e044d67fe40854c8f894aa6f6822e6611ea7b8fe5892
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links to similarly structured URLs suggests a coordinated effort to host or redirect to malicious payloads.

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://25p.undesirable.us/uploads/1/3/0/4/130477882/130477882.html#the+wraith+of+ugdenbog
    • http://lornasco.com/uploads/1/3/0/6/130605421/marufanefederobu.pdf
    • http://melanima.com/uploads/1/3/1/3/131380413/jobulujivobewupif.pdf
    • http://becomeagoldstardirector.com/uploads/1/3/0/2/130287426/nesobas.pdf
    • http://ryanraeandjayde.com/uploads/1/3/0/5/130588849/3517088.pdf
    • http://autodiscover.abovetherootscbd.com/uploads/1/3/1/6/131606125/2353845.pdf
    • http://901parkave.com/uploads/1/3/0/4/130489669/powuborugebulipogad.pdf
    • http://costwavecorporation.com/uploads/1/3/1/3/131381540/c97f2a.pdf
    • http://babyreadybundles.com/uploads/1/3/0/5/130544072/pisoboxuko_xosefoso.pdf
    • http://delethis.com/uploads/1/3/1/8/131871509/a6238e5.pdf
    • http://vineyouth.com/uploads/1/3/0/4/130478314/famoku.pdf
    • http://billsfrenchbulldogfriends.com/uploads/1/3/1/4/131453045/magurixite_velesefi_fikarejijoberat_lerexin.pdf
    • http://azhomeenergyaudits.com/uploads/1/3/0/8/130814630/murejowosox.pdf
    • http://byfieldallenassociates.com/uploads/1/3/0/8/130873955/a5c22c0d90.pdf
    • http://blueflamesphynx.com/uploads/1/3/1/3/131378973/0aaf5.pdf
    • http://hostmaster.matthewsmith-furniture.co.uk/uploads/1/3/1/4/131453021/152142.pdf
    • http://billyacopucci.com/uploads/1/3/0/8/130874535/6926373.pdf
    • http://nournournour.com/uploads/1/3/0/5/130540746/vitofafijat-bubapewuniv-wiruburezokikax-zuleretesab.pdf
    • http://imagerieofchange.com/uploads/1/3/1/1/131164446/479ed3d150.pdf
    • http://earthrevolution.org/uploads/1/3/0/7/130740065/forunafefelejevivub.pdf
    • http://orprealestatephoto.com/uploads/1/3/0/5/130551517/9969280.pdf
    • http://nereacarrerassmajeup.com/uploads/1/3/1/3/131383284/paxexeboto-jelazutasa.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_off0000711b.bin
95c67046ed68288be74d1752a6586e3a9467a7c097878386ce4e6664399971cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711B 10672 bytes

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