Malicious PDF — malware analysis report

Static analysis result for SHA-256 178bcce86879a0ee…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 03:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baab9b8c3a44ce95f9801246f811c2b6 SHA-1: a8827fbbb5a99086aeeeeeddc366c0239522b3c8 SHA-256: 178bcce86879a0eeb871c06314fdcc84dba188e47fbdd70f5e6c995988d40094
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. The document body is heavily obfuscated, but the presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=how+to+add+corporate+email+to+android PDF link annotation
    • http://constantemails.com/userfiles/file/1631570385belebuwizexigama.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/xisezelut.pdfIn PDF document text
    • http://seamacros.com/upload/file/77563791105.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/20071395402.pdfIn PDF document text
    • https://anakmeong.com/contents/files/15895473542.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/22153689628.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/80232844566.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/23430881644.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/nazakesusilenumibejifizat.pdfIn PDF document text
    • http://wmsone.com/eimages/file/kijisopumorajur.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc1adbb23---sabanolenew.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/92561727920.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/virakexukovim.pdfIn PDF document text
    • https://best-label.com/upload/files/69081831258.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wizodetosup.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wigekapisikurifizapa.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vetiki.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/43480195096.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/tukodumu.pdfIn PDF document text
    • https://simorgh.it/uploads/file/mekulewotuwazunixagonero.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/lenekodiw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613572bd74ddc---kelivanu.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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 10584 bytes
SHA-256: 8973cd6a165d6c8a3e9bb111b23ff657a3c692823eaaf3bcd35a07b79cca6f09
font_01_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 18032 bytes
SHA-256: 00fb1d36651d5f50e0bc4095904961e04e1e57305653c168dc4b9e2754f35c62
font_02_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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