Malicious PDF — malware analysis report

Static analysis result for SHA-256 1345900523213c49…

MALICIOUS

PDF

83.6 KB Created: 2021-03-16 01:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ae9eba9baa9a1581e0604dd0bc57300 SHA-1: a92e5887f8b31a21bcf4d774f500cbf5d0abe495 SHA-256: 1345900523213c4961c3daef4eeff505e23954dbd6a084b120ca6bc4a8f72eb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm or SEO spam document. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://xezojetit.ru/wix?keyword=alamut+filetype+pdf PDF link annotation
    • http://xemokajoled.medianewsonline.com/lefodijodapogumavovofam.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/fRhahbJ/subikefa.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/radumof-dakimewujejano-fewaxema-jemowunimafa.pdfIn PDF document text
    • https://teworovesub.weebly.com/uploads/1/3/0/7/130775402/duvigavab-xijefibunav-kumiziposil-viwowokivakika.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/zoology_textbook.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/bukuvewavedo.pdfIn PDF document text
    • https://puziwurawube.weebly.com/uploads/1/3/1/8/131871408/xirinenis.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/ihekicS/netflix_reversing_roe_csfd.pdfIn PDF document text
    • https://lesoloruvurer.weebly.com/uploads/1/3/6/0/136028926/f5378c7e3.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/aYhWhdb/pba_d_league_teams_2020.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/firex_smoke_alarm_going_off_for_no_reason.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zidenigad/66869718252.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/does_medicare_cover_automatic_pill_dispensers.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/literature_circle_role_sheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/embedded_clauses_worksheets_ks2.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/what_is_significant_coronary_artery_stenosis.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/optimate_4_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/zebegifivaji.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/takenoferulovobololo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 4672 bytes
SHA-256: a95d27a361a603a3886c32b187eca26e5d89fc92c6dc9f2948665fdd428beed7
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 14840 bytes
SHA-256: c00d5c86d7967d6bb7e9f99672466d42b130964635a65a7eaeb5d3917bdf12ea
font_02_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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