Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdfbed37efb0bb3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-16 01:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4d97be1214391a76b86aaca1208f3ae2 SHA-1: 9e0a00027abf4a5c72fda2316110b540e3a78446 SHA-256: 4bdfbed37efb0bb3090ac6b0b286cf6d49c8f19012617ccc6dae8f40879f8a5c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous external URLs suggests an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=dance+moms+full+episodes PDF link annotation
    • https://solener.info/ckfinder/userfiles/files/44500775481.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/86516967970.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wiwanogepep.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/84287963925.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/57015021308.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/ravuwufuzopudulixiraseke.pdfIn PDF document text
    • http://myredm.ru/uploads/file/tiwegiwegotidalaxis.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/dotemovesuzuxukigogibivul.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/43722227763.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/jetifodulu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xubilazupigimikur.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/70142634469.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/31469878709.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/59147889927.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gabakor.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/lexebobifazejojodazelut.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/jepakuz.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/97932027056.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/wavajutoxolurukig.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tojufuperadasa.pdfIn PDF document text
    • https://togeltop.net/contents/files/lamofupemudebazadatax.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_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 15616 bytes
SHA-256: fd3de17f63376daf90e314babc544629ad18fbf3c64364b2388c8b95ef0d626a
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 10684 bytes
SHA-256: 90afe89284089791fe8f17df59e7e18aef94ee529ca479f607d5c6491c70e48a

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