Malicious PDF — malware analysis report

Static analysis result for SHA-256 4244f03f5461e792…

MALICIOUS

PDF

67.9 KB Created: 2021-09-30 14:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 835dd9c23f0b140ca552c35481122e4a SHA-1: 8b6a94f9be1965d8a82f9f51a4f7ded961d793c6 SHA-256: 4244f03f5461e792541556c3c25c10f8d52c75b3e0c4edfe155c2d99680e508f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger. It contains numerous links to external domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://thecargonepal.com/userfiles/file/26590574638.pdf In PDF document text
    • https://theurbanthinktank.com/files/30320174637.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/womunabojukop.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d1r4bp0f19s0ujufjugn0aopjl/14287080104.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/98040026008.pdfIn PDF document text
    • https://conrays.ru/f/data/23764368177.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/sopumamona.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/werabixipitakatoz.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/86215801415.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/68693646085.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/32450474544.pdfIn PDF document text
    • http://teifsepahan.com/files/file/15840304896.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/tezivewijatatujosa.pdfIn PDF document text
    • http://bndweb.nl/upload/files/99176780623.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/pumomezijep.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/89722090310.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/pupav.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092713160173499.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/81315759575.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/64607629244.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/49753760923.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/busikepogizavaxupetizesi.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/bubapemizunidosoxezorov.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/tetejosorebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=messenger+video+call+prankPDF link annotation
    • 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_off0000ae10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 10740 bytes
SHA-256: 591acbd08a912e968b92eba17ebe626506fc626e3fed546b88377015eb29b647
font_01_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 13712 bytes
SHA-256: 65e4a69a1d3976446de3871a2f2df27c9969af6869dd837448ce82946dc1f55d
font_02_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1