Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de6286b576d71ef…

MALICIOUS

PDF

145.1 KB Created: 2021-03-10 18:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66dc45300c9f7e14888de12809b5d96 SHA-1: e79381df13fc1eb0bfad10dc4e6298489405a142 SHA-256: 8de6286b576d71ef071127cbdf0b443c616035c93e53cad4440bc621625d3d89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is used as a redirector with a UTM term, suggesting a phishing or scam lure. The PDF structure itself is also flagged for containing a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://zajinet.ru/aws?utm_term=grand+book+of+the+sith+pdf
    • http://net-klientov.ru/vovijerorinuwizuxeuepl1.pdf
    • http://lofajemami.sportsontheweb.net/79006908426.pdf
    • https://cdn-cms.f-static.net/uploads/4376375/normal_6047d74ef1f8c.pdf
    • http://vufiwopader.medianewsonline.com/how_to_check_fuel_pressure_on_dt466e.pdf
    • http://xewopixomimam.22web.org/safuxiwi.pdf
    • https://cdn-cms.f-static.net/uploads/4491965/normal_600fbc0ac244b.pdf
    • http://mopotiboxa.iblogger.org/94007940931.pdf
    • http://vadosixajobirug.mygamesonline.org/96183672364.pdf
    • https://cdn-cms.f-static.net/uploads/4426071/normal_60259e3082e11.pdf
    • http://newsportstechnology.ru/aiou_solved_assignment_spring_2019_freexrwdw.pdf
    • http://tatabumilik.iblogger.org/tipozulefili.pdf
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5fe594214ccfb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mogopubu.epizy.com/fagolal.pdf
    • http://fukatotapi.epizy.com/past_simple_regular_verbs.pdf
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_777482af9b19437087852c17ef948fdd.pdf?index=true
    • http://gurabagoderes.atwebpages.com/dujewotedobajesivagizore.pdf
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_d671a448308540d5ae2d90a00dd03dd7.pdf?index=true
    • http://fukodagugino.rf.gd/44166696486.pdf
    • http://zaruxokogidut.epizy.com/winkler_police_report.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_6a827bca36dc42458a73997c49073a2d.pdf?index=true
    • http://pulitisagot.atwebpages.com/29652349061.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fccf.bin
90598c90b61c032d36068ec54d3c97dbf8f1124c3399e331855eb20eb17bf445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCCF 5332 bytes
font_01_sfnt_off00020eea.bin
3bbea8439333123e0c144044e249441fdb9b3e9f731b75ea59666bdac6ee271b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20EEA 11448 bytes

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