Malicious PDF — malware analysis report

Static analysis result for SHA-256 467d7badb67d12df…

MALICIOUS

PDF

95.6 KB Created: 2021-02-24 12:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 499310677f214826e23bb66ec751a0a2 SHA-1: 5be1afc515e58a2448128570adb7a7c558d515ef SHA-256: 467d7badb67d12df71787b3a08ecad2d653149d6272833294a8f6e6ea62f847f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out the use of disposable hosting and redirectors, suggesting an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=orbit+easy+dial+4+station+manual+start PDF link annotation
    • https://cdn.sqhk.co/kokojisip/jixkggc/jumadififak.pdfIn PDF document text
    • http://xetudevera.22web.org/atopic_eczema_treatment_guidelines.pdfIn PDF document text
    • http://nuvemibopakukot.22web.org/tomtom_xl_n14644_preis.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/iEbG5hf/marketing_mix_elements_for_services.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_5ffa2f1b92def.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/2jkhhjc/pajelol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fe58b954f331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff28239bc80e.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/gQQGgdA/ultimate_lion_simulator_mod_apk_rexdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fce506c027ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raronamivado.epizy.com/brawl_stars_hack_2019.pdfIn PDF document text
    • http://joxumokuri.epizy.com/vasikovulojosuseraw.pdfIn PDF document text
    • http://mitoxewer.epizy.com/47251278399.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/beginner_s_guide_to_reading_schematics.pdfIn PDF document text
    • http://rawobebisef.epizy.com/self_guided_tours_israel.pdfIn PDF document text
    • http://wufajin.rf.gd/notapes.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/rotofo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 5328 bytes
SHA-256: a3810fc1e64b03568ab28ee87c2698e7f6894467cee76d6c51b3481d26ee7d5c
font_01_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 11284 bytes
SHA-256: 20b0e6c0b307a8d245960e4fe1d09be0f1722db4e39f354b1de915f1ba7edea1
font_02_sfnt_off00015bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 16076 bytes
SHA-256: c75124cf82eb85a290f44dee9d31b74c8eae8229c650450d727e37a6e1035227

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