Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d97bcb139b0dfe3…

MALICIOUS

PDF

77.4 KB Created: 2021-05-24 13:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4c7c1246547e44a6d714707853836ad6 SHA-1: 7bc189f8fb3d8971891e78f7a49e1b59eec395f4 SHA-256: 9d97bcb139b0dfe3cbd454b07e32c3c49076e839c8f1d1af3a7575b1ed8b8eef
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with at least two identified as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to making money and application names, suggesting a lure for phishing or scamming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=make+money+cash+app+bd In PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/624045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_604204c4165db.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/zudoxumowu-keladigunuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_60629e409d7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_60675d61ed738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427268/normal_5fed176f6cb3e.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/7fe5f57be8dd01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/70446828424.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/origami_boat_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/feltham_prison_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/22225595493.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/zifejusipup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf9dd04-cb06-4c8e-b5b2-337fd8db31ca/bugesagemejakoninutasati.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/75553313031.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/ruzizoxudologupuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/15928727489.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/56898084004.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/coleman_presidential_2_furnace_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e097a9c-f6db-4ed0-9fab-18005fb3b06c/ritexela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106ebf44-7c63-4411-970a-4717ca84768c/goruraxazelesukijaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/40029132585.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/kivog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f2bd76-22bf-4750-8702-64ca86c4ffff/juworubawumam.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 5496 bytes
SHA-256: 4934fb25d9ec5e3262fa9e70aa46fde04c49c9a6a8e84c6a9b8f937750394d0d
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 11160 bytes
SHA-256: 703f60bdff575541cf9fa7fd04ea59fa099f3615807ad942e2f191f9e21c5800

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