Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77807c80da15cb5…

MALICIOUS

PDF

71.3 KB Created: 2021-09-23 05:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aad505c7eb36581d640155777bab08d SHA-1: 099db26f871660cc7f28b0d9ad547719012ce1f7 SHA-256: b77807c80da15cb598a60e069ce115cc9bcc8d6e9b81791b83157db4a7540c19
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to PDF files suggests a link farm designed to host malicious content or redirect users. The primary attack pattern involves social engineering to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://phongkhamthienhoa.org/images/files/2510189471.pdf
    • http://zamgph.com/uploads/file/031411075231.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/87491173603.pdf
    • http://gramercygrand.ru/files/file/25771069148.pdf
    • http://allefrgycg.news-read.com/upload/files/20359094860.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/jazavenolibipavi.pdf
    • https://goldmenu.com/userfiles/file/zarevokunodukibixo.pdf
    • http://sevimticaret.net/userfiles/file/mujaxepikutopupitabomedi.pdf
    • http://mrpennarak.com/user_file/file/95618205048.pdf
    • http://xinghui.co/upload/ckimg/files/202109090557009857.pdf
    • https://ppkh.net/userfiles/file/voguf.pdf
    • https://bhiringisamsankalimandir.org/userfiles/file/gaseriduxiv.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614424652fcd4---11337031430.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210913/file/16315165606465.pdf
    • http://htygroup.com/upload/files/xezurakikeniditoxiwop.pdf
    • http://pm-ural.com/uploads/files/80748235467.pdf
    • https://okinawa4d.com/contents/files/78049709516.pdf
    • http://speckrepeg.by/UserFiles/files/25652565887.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/molevakowozobed.pdf
    • http://myhomeinparis.com/userfiles/files/21514131151.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jawani+phir+nahi+ani+2+full+movie
    • 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_off0000b663.bin
69cf96c489c9781f3f5614aef761008c1671e01eb41e28073c0362abd06bc74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 10720 bytes
font_01_sfnt_off0000cedd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
font_02_sfnt_off0000e6ef.bin
7fd3162a5cdff6f00ebb14c22df5eacc952a0ebda7f3c4f8940b6c4a418946b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 15896 bytes

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