Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f599dbc290b707…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 15:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91f8b51eedacadc0eae0d34ac64498e5 SHA-1: de398e7247f214c075b04656bc201e1e1fcf13a4 SHA-256: 85f599dbc290b7078ed7de51ab4dc3c3f00eb874e977b3841feef69994fa391b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a credential harvesting or MFA lure. The document contains numerous external URIs pointing to disposable hosting, suggesting it is part of a larger phishing infrastructure. While no scripts were explicitly extracted, the nature of the MFA lure and the embedded URLs indicate an attempt to trick users into providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://irlanc.ru/uplcv?utm_term=temp+sms+sender PDF link annotation
    • https://egca.fr/userfiles/file/davoboregabodeti.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614460e9643d7---rusodijado.pdfIn PDF document text
    • https://limadelimon.com/images/file/kilidabubuzewemewufope.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dutafalosidasivosaz.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/regazejetiwusurivemegute.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/97204576682.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/17798055995.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/90949088157.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/91287767139.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/31209652412.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/66277031432.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/nepinemowugije.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/81165733897.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/52244477032.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/10692503712.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/danapaxidolopapisezepadob.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/melirixemuz.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/gaxopijodidazewekuda.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/foteput.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/jajaxofapujofolazilifuk.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vawopojolodexakarodo.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/tuvolinisopot.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wifetidepogixipularaz.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/lalip.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87348285124.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/83436334705.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_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10000 bytes
SHA-256: 6d59224310216501d5c87df35b4068cbf6afc9020f432b8eeb87c554ca208bf2
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 22592 bytes
SHA-256: 01a282ceea74a35010cc411fc69306f780318225711d0bfd221ac5c3e82097a8