Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d91372091bf9372…

MALICIOUS

PDF

72.3 KB Created: 2021-05-16 14:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1eef82874716f8d0a88cf27d818ee0d0 SHA-1: 2b37c2107709106bf4e45c9afc69339a173f3fd0 SHA-256: 5d91372091bf9372f6a34a0bc4d611419d9442cc0cefbbbdb12d247400d2964b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically mentioning 'buy and sell old school runescape gold' and redirecting to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a link farm designed to obfuscate the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=buy+and+sell+old+school+runescape+gold PDF link annotation
    • https://cdn.sqhk.co/javomekoru/hieijha/lomidovikipa.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/33jchei/mahagenco_question_papers_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5ff10d91d7968.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/plantronics_headset_co54_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xemuxebu/jhz6kg7/cheat_lightning_fighter_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fcd6ccd15a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_6060b63595a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_602ba4fb23e53.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/ifjbijm/free_video_loop_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/iagchc1/liriripogavamamevil.pdfIn PDF document text
    • http://lafovawolifi.22web.org/zebra_zp_505_driver.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/WlBSBhh/galepamu.pdfIn PDF document text
    • http://pevokepavaxe.iblogger.org/how_to_video_from_linkedin_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/jlYAjdY/xcom_enemy_within_console_commands_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fcba4e456369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravigokabuf.rf.gd/48482405345.pdfIn PDF document text
    • http://jikebejilogotum.rf.gd/taiwan_visa_application_form_for_philippines.pdfIn PDF document text
    • http://penawukep.epizy.com/rupavoxiviw.pdfIn PDF document text
    • http://gewofudi.rf.gd/kikujiro_summer_piano_sheet.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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 5488 bytes
SHA-256: 23a18421951ed25313e543607117192cce6d9fdd6a1fdd30419e2697077a8f7b
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10188 bytes
SHA-256: 742c58edd810e492d2c244aa069d4b2f8d88d4a796906cd241932b7b3682dcfb

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