Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c75fa788f091622…

MALICIOUS

PDF

80.5 KB Created: 2021-02-20 03:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9c50b45a76a884a9c47713487a5c1023 SHA-1: 6a396a6845422111c4d80f157b34b41a0ddff923 SHA-256: 3c75fa788f091622d026a6d5e5a3839593f787ea42ea6b09a95890d824483645
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary ones pointing to suspicious domains like druttle.ru and medway24.com, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'invisible man book synopsis', indicating a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=invisible+man+book+synopsis PDF link annotation
    • http://medway24.com/biblical_fastingxu4ky.pdfIn PDF document text
    • https://bivovupoxewoko.weebly.com/uploads/1/3/1/3/131380626/6861429.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/kupuforazenid.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/lategemusizozudosezo.pdfIn PDF document text
    • http://good-production16.site/maytag_bravos_xl_mvwb835dw_washing_machine_reviewlct7y.pdfIn PDF document text
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/3d3f1d5cdeb.pdfIn PDF document text
    • http://doloxuwukur.iblogger.org/bhaagamathie_video_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6015dabf0bfd1.pdfIn PDF document text
    • http://yellownatural.space/3593982894mlyl7.pdfIn PDF document text
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/mimufuwapuvato.pdfIn PDF document text
    • http://my-favshopf.online/skip-_bo_castaway_caper_online_play7mru8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_601bbac83610d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lufasojaweg.epizy.com/torizawepiwuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/26735799952.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/setimetemeduribi.pdfIn PDF document text
    • http://xaxuvep.epizy.com/angular_form_cancel_button.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/facebook_cover_photo_collage_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/nikosutozibigatinozij.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_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 5172 bytes
SHA-256: 9c1da4b2c67d7388338abf2c8aca74b216ad8276cb58e72d268cd30989a7fa95
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 10512 bytes
SHA-256: 6c9652531655dc6001ed95b68e0d23cd146106ad2a87399a051a57c046a205c3

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