Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5a630a037482cd…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 09:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 74d473c403fe2c61a14e6e1a7efea2db SHA-1: 1839b6f0d35cba90946f901fa5bfd825d79e1c6a SHA-256: fe5a630a037482cd994a0ade66303d1545d4b6db0561edd196a21ea68681ce8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=the+great+ace+attorney+apk PDF link annotation
    • https://sofahatinh.com/upload/files/doxirojokikomenulolan.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/76080401599.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/84637364173.pdfIn PDF document text
    • http://symbolfoods.com/files/file///lidubugika.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/memegazotinemido.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-15/20210915144505859275.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/moxuwimeleke.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/24415043163.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/45762551784.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/pufudoxusikefojumari.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/70712599148.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/lukigorisofamodexumadafo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16145fc293f144---56731589234.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b1f38b751d2ed6aa131cc6a0a4bd6092/xomeruwedinazidisexewo.pdfIn PDF document text
    • https://eniedu.com/data/file/20210921070433.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/redifojopamabenem.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/41697004693.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/82740753117.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/vasojeforopu.pdfIn PDF document text
    • https://aaaxxion.info/images/file/12395602451.pdfIn PDF document text
    • http://farmina.ru/uploads/files/xagenaburenewalelufozor.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/53225909442.pdfIn PDF document text
    • http://protok.pro/upload/files/bovafakitunuvafazaxade.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_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 10516 bytes
SHA-256: 0e6d365ea79b6b5445fb5f78d033b9dc48116426ca7e18484c617ac85b739b43
font_02_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 17348 bytes
SHA-256: 9fdf29efb6229a360c7df1131be3d4973837b10794bb44e2d77dc4173380a9e5

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