Malicious PDF — malware analysis report

Static analysis result for SHA-256 a624ee455fd5ef35…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 13:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14fbe120cf7fba4c1e5f5be7ab4dacfe SHA-1: f842bcd56549c1f04182cadbbe1e494b03dc40a3 SHA-256: a624ee455fd5ef351ec53475dd222ad9241068de56efb6b8cbffe889c9e278a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to external PDF files hosted on potentially disposable domains. The presence of many unknown reputation URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://sanzmendia.com/userfiles/files/norez.pdf In PDF document text
    • https://preciseenergygroup.com/media/44472966071.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/jurodabesedebunodupezebip.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/45975148721.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/60630565283.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/15583258550.pdfIn PDF document text
    • http://state-lithium.com/upload/files/8429143604.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6102c73319843b7517cb33a1a82bff09/82982505870.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/39497656713.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/85483150478.pdfIn PDF document text
    • https://unosms.us/userfiles/file/17219944597.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210917_009FB671EAD1B123.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fizotire.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jofixutesijul.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/nepew.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/mugaxi.pdfIn PDF document text
    • https://designclarf.it/file/68505203072.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/51001069958.pdfIn PDF document text
    • https://ibextrail.com/editor-images/mamegumuvino.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/bexidufirogimojiruf.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/xamasalegamo.pdfIn PDF document text
    • https://braus.uz/images/shared/file/96853792199.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/boludazamojudikotedi.pdfIn PDF document text
    • https://mimpishio.com/contents/files/61527656114.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f316067a---29358366500.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/19088131996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fantastic+beasts+and+where+to+find+them+streaming+sub+engPDF 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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 19304 bytes
SHA-256: d38d43120af46f812f1b6ff3ee2d1c60fee8959aa3e30178d2be3d8ff1bc8394
font_01_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 11180 bytes
SHA-256: 1b4ab1915f31c06bf7d9a6568551e1eb2a65e4d21f5e173c3e4a1b7b6e0c3b96