Malicious PDF — malware analysis report

Static analysis result for SHA-256 252797df575c0d01…

MALICIOUS

PDF

77.4 KB Created: 2021-04-04 06:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4bce61412607c57355b8a4c3c18aa374 SHA-1: 5466b1e8b256449ed418cbb49b344b9aa82c448f SHA-256: 252797df575c0d015622e10e480b24aa03392019849489fc5ceadaf8ef16d7f9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/123?utm_term=advanced+excel+exercises PDF link annotation
    • http://pixidilivutep.medianewsonline.com/tevokofizuzipapilupew.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/my_fitbit_display_stopped_working.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ichgw4r/rolling_stone_magazine_top_500_albums_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/xjgokge/xizokubemegomawepuku.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/tratamiento_de_bartolinitis.pdfIn PDF document text
    • https://cdn.sqhk.co/xewebevij/a3hjeif/prime_knife_hit.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/jifhdgc/starlink_battle_for_atlas.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/fhiXjfk/zudogazabikojab.pdfIn PDF document text
    • https://cdn.sqhk.co/sifapudoxig/dhbdNIM/emma_s_adventure_california_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/cifAFhf/sas_zombie_assault_2_apk_download.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/1786082.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/xavawufoko.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/NxTWkjg/admin_template_html5_css3_free.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/52faf0685.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/46945426293.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/6higghf/destiny_2_outbreak_perfected_catalyst_2020.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/kawijivuxeli.pdfIn PDF document text
    • https://cdn.sqhk.co/butixasa/fhh0KeK/20811628992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_146ff32d00af4bbe990703bc369a0ca7.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_866abf7c05594eda88d19253c3378cc6.pdf?index=trueIn PDF document text
    • http://laxufazekez.atwebpages.com/french_to_english_textbook.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5052 bytes
SHA-256: 7214c3b35276a4e83abb166ef98d41cf97ef7d4389e3919471814bc964e66047
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10820 bytes
SHA-256: 12369789de8c3b39f2cc61930397cd887f0531a8d637e0878ea7dcb0f330c23d

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