Malicious PDF — malware analysis report

Static analysis result for SHA-256 02874f6eae0837f3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 15:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84854c83054492bd1655aeff4bef6037 SHA-1: f1180bfdcad49df8b8f5ce46770ccb49677fcd34 SHA-256: 02874f6eae0837f395e5daccd7906f02778c70712ac107db9107e7d50b9dedaa
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Session Token

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a credential harvesting lure. The heuristic 'SE_MFA_LURE' indicates the document is designed to trick users into providing one-time codes or MFA confirmations, consistent with stealing session tokens. Numerous embedded URLs point to PDF files hosted on various domains, likely serving as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://avesta-hmora.boj.se/uploads/userfiles/files/vodofukonenumamalipik.pdf In PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/25281846426.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/pokikakufozadebenizuponez.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wakitixitajabororariveg.pdfIn PDF document text
    • http://intertribo.sk/files/62667495814.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f175eee39---95472161871.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/detebulixusepaziteneje.pdfIn PDF document text
    • https://red-adlay.com/upload/files/27632676960.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/tevojavu.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/55123276358.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630545277.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/gunipa.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/19801614751.pdfIn PDF document text
    • https://digireg.cn/upload/mowilezizoxilazot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613615089d857---wamodofujaponufiw.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/79926656177.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lemefodaxufotidufemizu.pdfIn PDF document text
    • http://eva.am/files/60e2831b7dd80eb6.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/lorurekapumadubixuxezawe.pdfIn PDF document text
    • https://isosklo.cz/uploads/pifugibonewejogi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/zavafesilol.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/xodaxagupufiwu.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/watoxipokujinuxoliponev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+r6+credits+codes+2020PDF 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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 17588 bytes
SHA-256: 0dc36085b8d20235d2a791fa87cc31cbfe67087542799b9331966ca29873a4a0
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10440 bytes
SHA-256: c654b1198202ef798214936aa01a045964aac3aa3d77ee2c3e6c1c2a5932a956