Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d4f2161112e27b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 11:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1809efdd9fd65bf03866e17a42a44748 SHA-1: 1b156b5eb138a8d0da5e76c071dad3dc8bdf6828 SHA-256: 43d4f2161112e27b53ff516c0174fb137783c71bd41425ac8b00195afcbe4cf6
166 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting domains, a common tactic for phishing and malware distribution. The heuristic 'SE_CLICKFIX' indicates the document likely instructs the user to execute a command, suggesting a payload delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://bologen.ru/strik?utm_term=driver+printer+brother+hl-2240 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601baba46e9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_5fe89d2791ac4.pdfIn PDF document text
    • http://ligelasew.iblogger.org/msi_ms-7641_ver_3.0_motherboard.pdfIn PDF document text
    • http://bivadula.22web.org/is_7000_yen_a_lot_of_money.pdfIn PDF document text
    • http://muziwufugo.22web.org/unisa_application_for_admission_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabiporemug.epizy.com/jumble_puzzle_answers_for_august_12_2019.pdfIn PDF document text
    • http://lugavatakavupo.rf.gd/51892641284.pdfIn PDF document text
    • http://fisuwadufojotu.rf.gd/89563079939.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/golopapekogofowidijimige.pdfIn PDF document text
    • http://noniwelabezona.rf.gd/genetic_programming_tutorial.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_053e7c35f3904e18825b69025a67f55c.pdf?index=trueIn PDF document text
    • http://kubuxakul.epizy.com/70754353664.pdfIn PDF document text
    • http://gozosowizopuk.rf.gd/basha_movie_tamilyogi.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/suranelitis.pdfIn PDF document text
    • http://famefikapipu.epizy.com/26535636165.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/buccaneer_crossword_puzzle_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/mifurumijipalagumowe.pdfIn PDF document text
    • http://raxowiliti.epizy.com/woluvakojij.pdfIn PDF document text
    • http://fudedeki.rf.gd/admiral_car_insurance_policy_guide.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_ad0f5eeae3a443b0b0d2b50842282bad.pdf?index=trueIn PDF document text
    • http://geboxopok.rf.gd/rosizogosiwom.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/wudalebojivebuseluwaja.pdfIn PDF document text
    • http://xajazofi.rf.gd/insinkerator_badger_500_power_cord.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/drill_down_ssrs_report_in_ax_2012.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_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 5112 bytes
SHA-256: e56a8ad474073af8a18cf77155f53f336c57522dea36785485019514e4844cb7
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 10960 bytes
SHA-256: de7426e17a5a82ad3274f42023bdc996101f1c9c0805946883bf41943224ea42

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