Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0db576b3602d8e9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 02:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de97f20110a04b4e1dbc67f1a02ed937 SHA-1: 0fde2225d4f2832f575b895ea7224d20b88983f7 SHA-256: d0db576b3602d8e965276c1263aa38cff238e4fd7f550bdd295e03784e90a5c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=use+phone+as+motion+controller PDF link annotation
    • http://studiogallerani.it/userfiles/files/nefujanok.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/giwakavilerozobumevowibov.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/27203591470.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/jivilapuluwina.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/56592745836.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/40867223489.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lagutaxazov.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/jibowafazutajapujapajopi.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/57676115035.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210909095556.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/tobuturitexi.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/viputaxetepanezugivavu.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/745385427.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/nitufadudi.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/titafupudoges.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/68230610981.pdfIn PDF document text
    • http://kleiberit.ru/files/file/34519805513.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffd8109bf---tojefirefusozibam.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/59939773729.pdfIn PDF document text
    • http://446888.top/userfiles/file/76778143948.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/pamagupofiwutini.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912023919426520.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/6514551386.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/kedolekifulebaki.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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 10648 bytes
SHA-256: 08b860d0b0951151b516d803bc181ccca8573b2945592f9f2f500ec3b2ffe540
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 17304 bytes
SHA-256: a8ef772ae066100e0a62726f87e0a4be3ddcb4ce1f7616c1c7d51fe9eeb1ec01
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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