Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca55740411b968bd…

MALICIOUS

PDF

81.7 KB Created: 2021-10-11 23:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 699ab69ec0e9bfe63e4695cb908665d6 SHA-1: 479c95608165680f56b14c76de0cc59978390c56 SHA-256: ca55740411b968bd9ef516b2a546992d854121a5e5d89b9c05c2c0ed88594e89
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. It contains numerous external URLs, with one specifically identified as a potential phishing lure related to 'personal pop3 account'. The PDF structure and embedded links suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://allytemp.ru/uplcv?utm_term=personal+pop3+account PDF link annotation
    • https://vigilanciaweb.cl/dinamicos/files/file/kitinasupujod.pdfIn PDF document text
    • https://fong-cai.com/upload/files/komasesufinozegip.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/11362072936.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/59193114280.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jitewolosuwizuvaxozaxopig.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c669af05a7658b0e0f1042210d79fb59/vopitesiganoxomodip.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/56586804761.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xoxirefol.pdfIn PDF document text
    • http://telecycling.info/files/file/pugidikef.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/givakovirul.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/42633781744.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/13129999670.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/48581582545.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/puvupilakufokapajutes.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/31939336105.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/23117718600.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/tetuxometisuki.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/31650247965.pdfIn PDF document text
    • http://vhz.cz/user-files/wakadejuboxek.pdfIn PDF document text
    • http://clingac.es/d/files/41096402865.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/39048462482.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/jerirusodu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/neberowoxutegitazolodep.pdfIn PDF document text
    • http://artepcb.com/upload/files/40510022385.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/sorogapur.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10548 bytes
SHA-256: ab41415763ed8fb6d441003d4597ed4083bf97d0e8fe8fb56b40aca2416fd8dd
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 17524 bytes
SHA-256: 90dc1e1b7dd8eae17c836a57bafe534cdde111e9b2c27295e89e21bfc5039c26

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