Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe6a24791c84484…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 23:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a8a6afe11100c8f425a9083ad8542b5 SHA-1: 35b6b718c89bd232ded67ebb179a38b9bcab4ee5 SHA-256: ffe6a24791c844842960aad8190b1ab1f7e57d471d21bef6dad97bdbe2bb65cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with many pointing to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm structure on disposable hosting, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://seidels-mineralienwelt.de/images/uploaded/file/xijotevowisesu.pdf In PDF document text
    • http://61kidsclub.com/userfiles/file/93703337331.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/27233429179.pdfIn PDF document text
    • http://spbi.cz/res/file/59412241698.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/98338410910.pdfIn PDF document text
    • http://belovosushi.ru/files/94813635156.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/20599692420.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fofazo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210908_112359.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/gagerixubigev.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lukatutafi.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/rijuwises.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/41808528597.pdfIn PDF document text
    • http://kotolantopeni.cz/file/31264340654.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/62436213587.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/56755164469.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/sifurulonixezus.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nawupirewezipizewi.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ranawelusizotasim.pdfIn PDF document text
    • https://hobbypet.cz/files/file/59019577722.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e69d8553---7154498184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=john+wick+3+streaming+englishPDF 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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 17192 bytes
SHA-256: 8542a028fa7a1776be80b81cdf5790ced00c81d9706e671aa7c1ecc2fd35d8ac
font_01_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 11016 bytes
SHA-256: 1b244cbaa87f845b536603e7434f5a100fb6838b2bc3f9181c593ccb4105c925
font_02_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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