Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b96afbbcc795ff…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 21:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85e692503f645f654eb8029f340cf198 SHA-1: bdc02a3425fb3d4a177350f60a20ef5defcd23f6 SHA-256: b0b96afbbcc795ff20e6c5ecb9d20ec2100fed22643f0ef344608b45360359a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=text+message+wallpaper+for+android PDF link annotation
    • http://pinzimoniofiumicino.eu/userfiles/files/juxov.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/98017413546.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///rutopasilira.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/99352123581.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/mugonewoxusida.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/tabuzewenano.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/77071645845.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/viwewa.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/6116179176.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/mumeropoveguxef.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/namiwifofudu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/13875399672.pdfIn PDF document text
    • http://cssh.es/img/file/84414773496.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ac9ff97f5755f03110166dd10fbef995/23932597676.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wasoxugusonagebale.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/53576188445.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/86ed70575a3c1829d571a4de9b8de4b2/dufipurimirulasorode.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/74125114633.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vavinamamawipokezovofusik.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/dubeja.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109262131372309.pdfIn PDF document text
    • https://maisonforville.be/documents/file/poguxufado.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_off0000ac37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC37 10992 bytes
SHA-256: 0dfb2aa28f6a3b2cf7b1cbaf5fa19c4447e10dc5d2f1e366b3d04f3346e0dbbd
font_01_sfnt_off0000c591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 14836 bytes
SHA-256: 440532e6e0dbf6b794b7bb29df160e774a8af806309a69004c31a18eace98010
font_02_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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