Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34758c5f3f99c75…

MALICIOUS

PDF

76.6 KB Created: 2021-01-31 23:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e80a186f109e6928124933db2f3efb4f SHA-1: b9925d4877f633e2ea09d649bc02630f01f4698e SHA-256: f34758c5f3f99c753f5120d4a263b6ee24612457f743c17f5ab30b659c875e81
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document also exhibits characteristics of a callback phishing lure, suggesting an attempt to trick the user into interacting with malicious content. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms detection as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=https+caesars+docagent+net+mypaystub In PDF document text
    • http://lifeshop.pro/2017_chevrolet_malibu_premier_owners_manual4xlnd.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/eRvhdif/bubble_tea_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fee7366253da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_5fd38637f3152.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/Sefmef1/my_android_won_t_turn_on_at_all.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fe5d13c01795.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/uieifYe/ice_cream_recipe_with_egg_beaters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_600b2a80cf2de.pdfIn PDF document text
    • http://montana-media.com/duwedusovujakenewojixiwur40vy.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/cftgdIX/nostalgia_electrics_kegerator_krs6100ss.pdfIn PDF document text
    • http://myfirstsite.xyz/ghost_in_the_shell_characters7iszq.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/yjjgd6B/72118695010.pdfIn PDF document text
    • http://apparentlyopt.com/44507686648zyk9d.pdfIn PDF document text
    • https://cdn.sqhk.co/pepitaji/b4dihjb/saveborusulorel.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/hhjgggg/79194254036.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/dyAz46z/nascar_heat_mobile_mod_apk_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/ispad_hypoglycemia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/tinakenuvobupaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/basic_english_speaking_lessons.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 5564 bytes
SHA-256: a72f1073afc324915d6b894ce59c1fc5c1e36fe9cedc196cec5f6ce6c2fdf264
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11632 bytes
SHA-256: ae86951b019697ad25bda41c65356e186a3b41315bd2cfab0be6007d3b992945

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