Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b59adb4f11d3e0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 06:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8b840602815b0e350a3363b32f556e6 SHA-1: d2b21ec7ee7a099d5e1fa232f2dbe7a655fb4251 SHA-256: 73b59adb4f11d3e084d0ac11c1042c6420ae74ec093a7cd17a78719916d24f38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of these URLs and the overall detection profile strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=c%2B%2B+programs+with+solutions+pdf PDF link annotation
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/53975770164.pdfIn PDF document text
    • https://venus-forever.com/image/files/17982790886.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/pabevumorib.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/tinolavizalurowudo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/guvinuborakonodabuveb.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/kixabinomizog.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/titoborasu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914192022.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/xozepevufumome.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/94833585902.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/54874905157.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/81424974913.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/80357161988.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/penanufufopusasufiko.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/32933779805.pdfIn PDF document text
    • https://uudanbury.life/files/file/11010381411.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/modegiwulokuxisifut.pdfIn PDF document text
    • http://esen.life/userfiles/file/muromagawijitiva.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/jubaras.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/29973315423.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/56745162668.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/169976671.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/najanalawawitigem.pdfIn PDF document text
    • http://kawanmto.org/contents/files/zuzopuloxedefijavila.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/mowopitago.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B4 15504 bytes
SHA-256: 87a723cbb19a0859600440c9fb6f49e6454e1dec1128632f0cbe368e8682b4f1
font_01_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 11028 bytes
SHA-256: 0a8b08d85dbefa5b312ee4979c1548aff4974ca5cea49dc0665fc0391ed6ad38
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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