Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece099674ffc8e8d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 477c26ef80bd06c2c217cb114159cd51 SHA-1: 01aa4e2c32f42941156ccbd401a5b5df3d0dfd9d SHA-256: ece099674ffc8e8d6060c09e8639ecd0064af36fd078fd104c69017f5c2fcbee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on potentially disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vetregistr.com/ckfinder/userfiles/files/6039595804.pdf In PDF document text
    • https://arendic.cl/files/20774834399.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210906045730.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/diwudegamiligodakim.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xeziranurijudeloka.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/tebomokub.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/59630534074.pdfIn PDF document text
    • http://asid.rw/userfiles/file/vabitowutavew.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/32820913974.pdfIn PDF document text
    • https://gdaniec.com/upload/files/welusowujud.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/21651893500.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/19442088187.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/8919875168.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tefepigorip.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/80857896674.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210924212347_MjI0MjAwODk1Mw==.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/mufozifuxumu.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/pubuwavi.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/60132677759.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/31011510555.pdfIn PDF document text
    • https://jin-ji.com/upload/files/32490676578.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jumutuviralu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/fovasudijefi.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/78468670992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=spongebob+squarepants+game+freePDF 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_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 11024 bytes
SHA-256: 534d5f23866e89d6311e93cbdeb3428e68d7774b05103adbc36efcc1f78ba337
font_02_sfnt_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 17312 bytes
SHA-256: 98dc44dfdffb5178df2d9ec8638a769e72f5d8007e1ed088f93ccb53782e980d

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