Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b5b484b35c69ae…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 00:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e9e0bb2f24f2e5f5366cf444db4135d SHA-1: 29209c11946f916b46754d9554b7ec8c8ac2d0e3 SHA-256: b3b5b484b35c69ae42a8c6f9ace86136d57727afe796d7807d7bef8cb0972c2d
146 Risk Score

Malware Insights

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

The file is a PDF that was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number in a deceptive context. Although no scripts were directly extracted, the PDF structure and external links suggest it is designed to redirect users to malicious sites or initiate fraudulent communications.

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
  • 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://irlanc.ru/uplcv?utm_term=itube+per+android+download+gratis PDF link annotation
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/33681518276.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/64982971301.pdfIn PDF document text
    • http://fnathservices.com/upload/file/50237098694.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/74683014886.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/jefekutan.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/7520988602.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136d1c906806---77066362783.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/resewefenaguwupexa.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/53578918696.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/botagozav.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/rujugagados.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/17891973008.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/57799395267.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/wavilelaronilup.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/01eda7b61f1ad313034bf525971faa58/30780487256.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/mamatixiv.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vewuva.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/zoxerisu.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/32193028652.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/roref.pdfIn PDF document text
    • http://synhbio.com/upload/files/wozeguz.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/rojodujowurilagokev.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/53801770034.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/62614596391.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_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 14256 bytes
SHA-256: 50f4f7844cb9751726cbc55f398e3b8c00b5ec74a68d7778af56a784723cf393
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 10844 bytes
SHA-256: 78e24b72d581c0e9c23d2638f4fe193d0b62955ef9a4e0915240d14b4575f173