Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1b17b3e96778da…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 16:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65b09c75d93dd649ef5e48f6dab45d26 SHA-1: f12a11ab801236532106329a98839e6c4364018b SHA-256: 1a1b17b3e96778dae36924a69e4a387382b6d5359d3db4d490780423ac9dc50d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=gangstar+on+android PDF link annotation
    • http://zhouzhuanx.com/v15/Upload/file/20219786193738.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/58128544796.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/57622610244.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ag7Hq0VmSMZutsV4.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/favamasoxiwosuruzerow.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/37193437299.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/99444163887.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/jebawujazexesavijodavuga.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/71981944977.pdfIn PDF document text
    • https://mashura.co/userfiles/files/61510306177.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40242843903.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/16229213079.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/59200408516.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/vobokiwe.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161351207b49b9---rejasavofobuwuwe.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/jolekavip.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rejifulasiruxibifewowo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kipakuni.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/99945940827.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8da73506---labudewi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161453f8f987ed---xekiberito.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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 17900 bytes
SHA-256: 27f4421f5604b6e6269def5c768662e77456f6d877c42de7fe2081a0a408dee3
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 10284 bytes
SHA-256: 77f04a31dbad9bca4ee1376ffec3bbd300bed6ad1de2e4a0ef92f845bf80ed71

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