Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e21c22ebf22a8d8…

MALICIOUS

PDF

66.2 KB Created: 2021-09-10 11:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a8c42d7248ccfd5d65b83ee8c192a2f SHA-1: 3df974504ff27c1255d080268990808a7f23d4b8 SHA-256: 3e21c22ebf22a8d8d6d8f6945a2f2a7e7f66c8926db00315e10078a8135ded95
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document designed to trick users into clicking a link, a common phishing tactic. The presence of numerous external URIs, many hosted on disposable domains, further supports this assessment. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://ascensionchina.com/userfiles/file/jaxinu.pdf In PDF document text
    • http://z-sinpro.com/upload/files/xivawuxopinujepizujexikuv.pdfIn PDF document text
    • https://aksusu.com/upload/files/8220393320.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e5632d5b9ed8611036e299094b59d3ab/72113993830.pdfIn PDF document text
    • https://somogyplusz.hu/files/34869326020.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/siminafikoxe.pdfIn PDF document text
    • http://coolscape.info/images/files/93686867232.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/24858703664.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/4055736724.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/pexuxewoxenutekez.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wojebuxegaxufudujabuk.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/jumijan.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/30550061594.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/wulenufubovimasonom.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/xidagavoruwapope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tantra+yoga+sexualidad+sagrada+pdfPDF link annotation
    • 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_off0000a6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 14128 bytes
SHA-256: 7e524b161478006d1e7944b6d6b122a4a8a31caf00903426bb2d74b08bdbf2c2
font_02_sfnt_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 10952 bytes
SHA-256: e6faae281a27caa176b0343050724651e080b8ad560dac9aba85c516b2ae3c83

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