Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9833df9372835a…

MALICIOUS

PDF

103.5 KB Created: 2021-05-19 06:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b999452801a53c10fd7faf161e913e SHA-1: b39c030a41d034f3bc66fbf38d4ed9c06c72185e SHA-256: 5b9833df9372835a0c67ccc8fedb53b9f69465869ecfe6a73db49802feb949bf
124 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it contains external URIs and a visual download button lure. The document body, though heavily obfuscated, contains text related to 'android auto' and 'wkhtmltopdf', suggesting a potential lure. The presence of an embedded URL points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=can+i+play+videos+on+android+auto
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/zezuvafalixidod.pdf
    • http://lanasobewusek.22web.org/behaviour_comments_for_school_reports.pdf
    • https://static.s123-cdn-static.com/uploads/4446264/normal_60098421a4fb1.pdf
    • https://cdn-cms.f-static.net/uploads/4460966/normal_601b3c037f978.pdf
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/4927110.pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_603b15ecc4ed2.pdf
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/1581909.pdf
    • https://kumekebiwoxig.weebly.com/uploads/1/3/0/7/130739238/5481233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jenesigafepi.epizy.com/rakukegisaxin.pdf
    • http://xukonepuwe.rf.gd/49521633211.pdf
    • https://s3.amazonaws.com/muvazi/strength_training_at_home_without_equipment_video.pdf
    • https://uploads.strikinglycdn.com/files/7cab89bf-6e12-4031-abee-fdb5de7945ee/do_police_write_reports_traffic_tickets.pdf
    • http://paborijobo.epizy.com/deficiencia_de_vitamina_c.pdf
    • http://vajitefafuxuz.epizy.com/jikexogabapuxupizinuxoxo.pdf
    • http://nizipere.epizy.com/machine_learning_bachelor_thesis.pdf
    • https://s3.amazonaws.com/dosalapasenow/1094334288.pdf
    • https://s3.amazonaws.com/mekonulegipero/job_application_letter_format_in_gujarati.pdf
    • http://lagadasisipas.rf.gd/rational_rose_uml_diagrams_software_free.pdf
    • https://uploads.strikinglycdn.com/files/8c6de9dc-0ac3-4c7a-974a-cf819d8c4e0c/49953383125.pdf
    • http://maretazijedoval.epizy.com/agrale_4100_manual.pdf
    • https://uploads.strikinglycdn.com/files/20a4aaca-99f8-4e87-9801-733408c3ca32/how_to_manual_reset_flame_rollout_switch.pdf
    • https://uploads.strikinglycdn.com/files/bb5eae90-8403-42f4-b64a-3361715c7cef/which_is_the_best_dslr_camera_for_a_beginner_photographer.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_off00015415.bin
ac6b592366d905c7bae967483856cca233d05da2d78c28cd1d14718d82147964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15415 5020 bytes
font_01_sfnt_off0001653e.bin
41a57206518999e2aad6c5ed112a06b9c4bdc7e8dbe6ee5bbc5f79b1f4ff6a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1653E 12864 bytes

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