Malicious PDF — malware analysis report

Static analysis result for SHA-256 3183dd6eb8c3462b…

MALICIOUS

PDF

77.2 KB Created: 2021-05-07 02:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5352067c53113e9b77dfb6e8091c3c12 SHA-1: 42bb1f346a85391e769af3d5b9e7a76455b3ba0b SHA-256: 3183dd6eb8c3462b641bcec2fb8bc49fe78df93003ca376cfc746bc31d3b7f98
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The presence of 'cmd.pdf' and references to command execution in the document text suggest an attempt to exploit system commands, possibly via embedded JavaScript.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=michigan+child+support+formula+2020 PDF link annotation
    • https://cdn.sqhk.co/xugiwatokax/PH4dahb/42257860780.pdfIn macro / runtime command snippet
    • http://ladujose.sportsontheweb.net/graphic_design_jobs_atlanta_ga_entry_level.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fc59abc7dd5d.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/application_form_schengen_visa_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449402/normal_603c69ee2679c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_601be4018a507.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/izrZNig/befolujikezugudavuxige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0fa40e-a2e5-4eb1-8db9-f1087dbbcbf4/how_to_check_serial_number_of_laptop_in_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5f9b16-a6af-430f-9b3e-ed0c5c4fd6a2/moon_river_guitar_chords_frank_sinatra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c41ff79-a8ca-480b-977b-8a7b4e3dcdc0/koxedumunoxidarurivurav.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/notewov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8800806-0bf3-4ed7-a98d-c54d81fc086a/car_battery_tender_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/interior_designing_companies_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947cf0ae-76a2-4b84-b330-d69897534e19/liftmaster_formula_1_program_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/emotional_freedom_technique_script.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/what_would_cause_my_battery_light_to_come_on_while_driving.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/onkyo_tx-nr709_hard_reset.pdfIn PDF document text
    • http://segigeserife.epizy.com/word_cookies_coffee_level_18_answers.pdfIn PDF document text
    • http://potefedezazox.rf.gd/hungry_dragon_mod_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/how_many_miles_can_a_2008_honda_civic_hybrid_last.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
    • https://uploads.strikinglycdn.com/files/ca5f9b16-a6aIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5848 bytes
SHA-256: f102ae00e231f486e5cbe53fbb80d26d871373f02ac04c2fb5980ae2f1cc16b6
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 10732 bytes
SHA-256: 7eca944c88fe4b1a944cc02b6e96d8c8270efef55a802ce45eb08241df571a81