Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3c288ce668ced6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 06:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89e0a9d34086a62dbc8445e9c3472fac SHA-1: 02e0c5e58be5dcb4f99a46a25e25f478178f0a8b SHA-256: 4e3c288ce668ced6da7d698161614ab307dade0b9a2a7d2ef47eb3871514a4b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to direct users to potentially harmful websites. The document body is heavily obfuscated and contains no readable content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fcraregistration.com/UploadedData/file/75470203048.pdf In PDF document text
    • http://tnslib.tools/userfiles/files/71725915611.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ko4rg022sp1ogprr6keiegj0mt/lolejoweletiravawebu.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/getafaribonizudixig.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/90498913584.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/29914619565.pdfIn PDF document text
    • https://epiphanych.com/images/file/42709144269.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/viluzepenonilerijofolura.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/91234642637.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nasijutabivixapodo.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/60840471707.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/pikepezaredomozixu.pdfIn PDF document text
    • http://briztravel.com/upload/files/23982896651.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/dazunowofuruwit.pdfIn PDF document text
    • http://mayjack.com/upload/files/migiwaxemis.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/bawelosofuzixesadufopole.pdfIn PDF document text
    • http://attlas.center/userfiles/file/veradigopotis.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109171803226366.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/putogikakobobimoxuwaviw.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/kiloverobufenebolojako.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/dedon.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/bokomitoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+studio+web+app+examplePDF 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_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 17840 bytes
SHA-256: 29f6d6f99a98b0ad8b53976376e7305cc14ab361571e41b706db516ad3ed0062
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 17208 bytes
SHA-256: d4605a259032f5932f855791a5160a58f6a92adbdb3348b361e8d2468898e657

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