Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74c5a169e2cadff…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 05:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71c5911689ab5d643131236e34ebb0b0 SHA-1: 9a14b00edf9a9574eb891594712f1d3546da1bbd SHA-256: f74c5a169e2cadff914f5be097c4f1e0f0bafd0e5ef23686ee7a71d42bfa2c2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF's primary function is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=game+emulator+for+free+fire PDF link annotation
    • http://hastensandbreakfast.nl/userfiles/file/xasavikikaru.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/3218578037.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/lujabomizimopiri.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/36223584641.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/15453959730.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/bifumetimuxujami.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/88167712519.pdfIn PDF document text
    • http://allycatering.com/userfiles/68772352584.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/3038006871.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac99f18cd1---somaxa.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/zijokaraxu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/50316800668.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec17a45e9a---6675238368.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/godebewunivik.pdfIn PDF document text
    • http://olympusflights.com/files/files/85007254573.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/weluputiwemizevuvag.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/54940961873.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xokutep.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630845255kajubupu.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/99292584616.pdfIn PDF document text
    • http://slsnn.ru/content/file/32527761669.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/vanojomururam.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32934215887.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 10240 bytes
SHA-256: 50f37db33884db414c6a55ff11ad97434e0949024a4992088a41bbfda36d6d7f
font_02_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 17976 bytes
SHA-256: 0c549c6735dedd713bf7ed6e36e87504c7cdf85fc5c313fca1c2d8fd4909af73

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