Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d215ae061463c9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 23:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3db0714f19234d815b0adc291835c94a SHA-1: 34c96f2a7c3ba6416e7d6d1afb8c1cfea6d94a73 SHA-256: b1d215ae061463c99822186205865ec6119a02fab07989cd7e6e8d57476a57f4
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3556a9vv5a9mb05el1bnvb2eo7/81712729945.pdf In PDF document text
    • http://brkvinc.com/userfiles/file/mesakewegejobiwemaximona.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/kumeka.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/90364189591.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/35427297421.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/15788355071.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/rajiw.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/venogorira.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/71824193210.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/mimigesuxeb.pdfIn PDF document text
    • https://agatanorek.com/files/file/77346312131.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/12855473468.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/dubusazawamedob.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/58002972538.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/29433528566.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/48280202347.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b714504008---zisadadawisuwewizunu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/88901905127.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/69485301148.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/xuzapolikolojudufaxadov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=justice+league+snyder+cut+stream+hdPDF 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_off0000ab59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB59 10904 bytes
SHA-256: f788e8bc0a388e3518af0363c19ebc06ac09016e1971129f94ce8ee09f5617f5
font_01_sfnt_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 18044 bytes
SHA-256: c216eeb83cc61a071b9776504a8c212fba31203014388290bc0ee9c8442cafdf

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