Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3daa54fe39865e5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 02:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df00ab037be7c28e98532c3e4c496883 SHA-1: 2823b7af8b6b792be608d456b2009e2748cedbf1 SHA-256: a3daa54fe39865e557da8c6f4b6c6252b94aa219bdec4e7e722f57c544c138e1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

The heuristic 'SE_MFA_LURE' strongly indicates a credential harvesting attempt, likely by impersonating a login or authentication process. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, further supports a phishing or malicious redirection scheme. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the redirection or display the lure content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=online+sms+to+mobile
    • http://geoodwierty.pl/files/file/18574227891.pdf
    • http://rfinshaat.az/userfiles/file/25008890940.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/zovikiferilitiginisuweza.pdf
    • http://trumoi-khutrung.com/upload/files/32367995861.pdf
    • http://alituncer.net/userfiles/file/70221013010.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/84987867867.pdf
    • http://szpitalstrzelin.pl/userfiles/files/79277081945.pdf
    • https://swapnauraan.com/ckfinder/userfiles/files/23840338726.pdf
    • http://pincesorvarshop.hu/editor_up/37058439215.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161305d5434353---zagovowosemu.pdf
    • http://photo-preiss.com/upload_files/files/pobekewikosefavorumo.pdf
    • https://kimcert.net/E/file/18087455140.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d56790278---31671955152.pdf
    • https://nikosdimos.gr/userfiles/file/59920212880.pdf
    • https://gaadalagi.com/contents/files/puzawizawu.pdf
    • http://form4concrete.ru/pics/cont/file/27403929424.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/guxefesusobijogavibilor.pdf
    • http://madmojo.com/fckupload/file/jikoxupepatuvupidugub.pdf
    • http://filippodelvita.com/demo/userfiles/file/lawavusiwede.pdf
    • http://mikomisushiwc.com/uploads/files/55260005726.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/64214636775.pdf
    • http://acril.ru/ufiles/files/48576388838.pdf
    • http://sunrui-ti.com/d/files/xafekijovebukig.pdf
    • https://europartner2.pl/uploads/losojo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d660.bin
69de1e85d3fc672f7128cf5e63ba3923c85e4d7b8204e0601f27ae194c71877d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 17544 bytes
font_01_sfnt_off0001033f.bin
650aeb958de6d91c50ee66b420f457e8cdf26d6981adc9f40f0483f206c20437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10172 bytes
font_02_sfnt_off00011a02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 16792 bytes

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