Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c9cb5b3f9a8248…

MALICIOUS

PDF

130.7 KB Created: 2021-03-09 23:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a70ad03b5427a9c448211fb4b4e4a3e SHA-1: 714e1e4ea14f0c41d6b6c782cd7ca7c4ebdfb4b1 SHA-256: 12c9cb5b3f9a8248ce4516986f7aa36064475d99477e4fa04963c99cfbd6d239
116 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. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, urging the user to call a phone number. While no scripts were extracted, the presence of embedded URLs, including one pointing to 'zajinet.ru', suggests an attempt to direct the user to malicious content or services. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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.
  • 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/strik?utm_term=nc+drivers+license+renewal+test+signs
    • http://zezasarasojid.mywebcommunity.org/what_is_the_best_case_for_galaxy_s9_plus.pdf
    • https://static.s123-cdn-static.com/uploads/4418567/normal_5fe5b3c592345.pdf
    • http://manibupefif.mypressonline.com/47794708678.pdf
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fe868a683c77.pdf
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5fcc95b264421.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6020b325e023e.pdf
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fe481f2b4dcf.pdf
    • http://pivolirarorip.mypressonline.com/como_agua_para_chocolate_laura_esquivel_english_translation.pdf
    • http://gejesixave.scienceontheweb.net/does_simba_and_nala_have_a_baby.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_5abd8ef3f5d5452c8a69b642a6d783ed.pdf?index=true
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_ce2d20a3594f469493d08b8afb162111.pdf?index=true
    • https://uploads.strikinglycdn.com/files/26b1ec8c-afb4-4610-aa32-11fb93d98752/66520308206.pdf
    • https://uploads.strikinglycdn.com/files/1dab6faa-cbdb-411b-8524-68cfa121d71a/trigonometry_textbook_10th_edition.pdf
    • https://uploads.strikinglycdn.com/files/3fea0446-3899-4c49-9455-1a0817dcd2c5/41409598049.pdf
    • https://s3.amazonaws.com/legobegutulo/4760588096.pdf
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_d47eb242a13f47759839a8e7954baf5a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41ec2418-4893-4f07-a622-49ff8c2678a0/my_ryobi_electric_pressure_washer_will_not_start.pdf
    • https://s3.amazonaws.com/kigavanus/stick_figure_burial_ground_album.pdf
    • http://mukanebesiva.atwebpages.com/ted_chiang_exhalation_short_story.pdf
    • http://nuluwajewugutik.onlinewebshop.net/mumokudaruwaruta.pdf
    • https://s3.amazonaws.com/vapelurowar/rubaruganajeketazis.pdf
    • https://uploads.strikinglycdn.com/files/e9dbcc66-d91b-4b68-a8dc-81224fe7750b/how_to_reset_maintenance_required_light_on_2002_honda_civic.pdf
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_2cd75660bb2f48fb947c5e99f6dab735.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b255.bin
17819c7405686defacb35da9e4dd998259a25082f83298c5080dc99e8cfb53c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B255 4908 bytes
font_01_sfnt_off0001c320.bin
14f450e3c4b0209f98be8e5e3a3cc16c5b8c175ccc632609d624523621a00e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C320 13316 bytes
font_02_sfnt_off0001ee60.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE60 4324 bytes

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