Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18b1899041575e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 08:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e023fd23acf73efc78122a98119b7941 SHA-1: 091f082bb3cba696189d7c69b8302858cc982762 SHA-256: bf18b1899041575ecdbc726b79d7ed353df9bcfcb4eb82940e2c609110552c92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=language+spoken+in+mainland+china PDF link annotation
    • https://a-metal.e-giant.net/archive/file/files/nadarusoxa.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xufijipudefokolebowuwu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/rifasodofajodoribofusudit.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/galofibuzogizad.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sexujune.pdfIn PDF document text
    • http://canadanur.com/resimler/files/gemilolalejibotamej.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/bolagedobinenexipiwusa.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/16870871791.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908032654.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/94313707355.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/nosenusofet.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312af16a454---77490503854.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/37130762519.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/vopabukijusekudasebibex.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/newegezuladifekowetalafu.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jevipigataguzorapu.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/10164493979.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/mufumuzasufazaf.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/zemitugafatas.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/wirowusutepulolenibog.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/79517437794.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/dakilox.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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 20912 bytes
SHA-256: dc5cc2eb7546ef9615a355baa4629dd3b07943dea20d1c0126d0f9295043ca16
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 10912 bytes
SHA-256: 3952e2f9294428e658fe659ce9771f08fb446e6bacb26c7d978af22c8c6c45a8

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