Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75d6943b4508880…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 15:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287dc57317088717ec87da1769f18b3a SHA-1: 07f5297ba699ced16824975000feb6e0f239b1b3 SHA-256: a75d6943b4508880822b5dee00c90b7c95ffe1abf5252133278f3b01c87326f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, indicating a potential phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://strongpointmarketing.net/userfiles/file/39640692506.pdf
    • http://infinity-pro.ru/userfiles/file/putozibo.pdf
    • http://kleinschaden-expert.de/userfiles/file/temapameluwonavozafon.pdf
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/mawepadet.pdf
    • http://studiodugnani.it/userfiles/files/bowazusibetedogeditijog.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/26342199292.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/mopivozuvumakaxanizunari.pdf
    • https://shibbirs.com/media/files/37926511936.pdf
    • https://kidneystonetreatment.in/userfiles/files/jageretujaxirudoxosutas.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/92369576959.pdf
    • http://maidichike.com/upload/files/fumutasodivemawibifejel.pdf
    • http://gpszone.hu/upload/userfiles/file/puluweparukixusezemuvexew.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gixiragapamagisegibuzuf.pdf
    • http://sbcnepal.com/images/file/97812489961.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/82261765315.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s5g9dm1sh1lugbljt57r24nftn/besajabigugofona.pdf
    • http://enricobarraco.com/files/83858025836.pdf
    • http://world-green-hope.com/uploads/files/78650955227.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/pevugedoleguxexo.pdf
    • https://pt2-turbo-j3t.com/contents/files/69406915543.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/dodunamu.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/lirakidazinimajumija.pdf
    • https://olterus.org/contents/files/nibutuzujulivusiwifanamer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rate+of+change+of+work
    • http://e1pl2.nazwa.pl/busy/fotki/file/bavoxafedewiwedaranora.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9fd.bin
b23120bde021bee9e7e2828abc9b22285c4f77d96dc01abac5665e4addf8cfae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 18232 bytes
font_01_sfnt_off0000f95f.bin
f17521c82f4cd1bbe53fe71614f2de126ed90fb650849fed83f506ef44c137e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10532 bytes
font_02_sfnt_off00011172.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16792 bytes

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