Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fd816182eb56d1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 08:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34a031fbe488c1ddf48e4645fe87b196 SHA-1: 5f218e62b34baae36ab79ea615c9b798c28d00cd SHA-256: 89fd816182eb56d1c8e2fdec080c0c63cb7d34e20fb49eb5d6f7133914bd3df7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains hosting other PDFs. The presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://geofer.eu/userfiles/files/nisalaligejetuxulosofivuk.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bedef5fa0cb181aee6446610e050888b/vadupuvuras.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/goxarukikosimufusij.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/79926898855.pdf
    • http://gearcon-eng.com/file_media/file_image/file/34614008761.pdf
    • http://cycling-software.com/files/file/dubutojirofajizewakego.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9u5pnn4qbgoamed5ijlgpieir3/8104048693.pdf
    • http://jlicentral.com/images/authors/file/dusuluxazobut.pdf
    • https://loyalangkorapartment.com/userfiles/file/68901278291.pdf
    • http://abnicum.com/files/file/jugase.pdf
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/sufapi.pdf
    • http://centreforeffectivecoaching.com/media/file/53763355759.pdf
    • http://consol.hu/images/uploadedimages/file/xonulo.pdf
    • http://art-ball.net/files/file/judusopololobokepomuxex.pdf
    • https://ymvii.com/admin/upload/files/54055345694.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/36639812365.pdf
    • http://floramarble.com/uploads/pefozez.pdf
    • http://devitohomesorlando.com/userfiles/files/negejitivi.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/jolodanebaxexek.pdf
    • https://brukspec.pl/upload/file/muzevojorakavutakaxikagoj.pdf
    • https://kaskad-74.ru/images/uploads/walezuwinusufozew.pdf
    • http://thegioimercedes.com/upload/files/wiginosoxuralokinovewa.pdf
    • http://mc-opony.pl/files/file/pafivojezixapexizaworazu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=archery+king+mod+apk
    • 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_off0000af21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF21 16792 bytes
font_01_sfnt_off0000c733.bin
8d06d73d075a716397a4ea10d790b083c6bde94d49d20e608639900539bda7df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 15948 bytes
font_02_sfnt_off0000f037.bin
86c040e18c7e1a5ed2a30c5b80fe9c6d98c295fbab2061146496e1303dfa13a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 10836 bytes

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