Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faccee3b469c9f7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 09:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3301d31389e50efbffd83da19adaa5b SHA-1: dbb0e6e9d15ecb39b26e0f76067c4f7b41b6c61c SHA-256: 9faccee3b469c9f76db0bdf5e8478e3b216aa9eb79b8357d923744b4a18a05ad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and the presence of many distinct, low-reputation URLs support this assessment.

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 https://archism.ru/uplcv?utm_term=insaniquarium+android+mod+apk
    • http://centromp.it/userfiles/files/jatukidafogekujam.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904221328340819.pdf
    • http://telekommarketing.com/firme_data/files/12235088027.pdf
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/77286553099.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144caea458f0---lotirowofono.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/85264781756.pdf
    • http://www.deep2001.com/images/library/File/xewoliroveliduditaj.pdf
    • https://thehouseproduction.net/file/86663236662.pdf
    • https://swift-tw.com/lcc/upload/files/22799774613.pdf
    • http://tpt.taipei/asset/uploads/files/86956783083.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zajefusagovuvetizabifab.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/jimagijibunusalaf.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/31534504293.pdf
    • http://wx-test.com/upload/ckimg/files/202109060045267992.pdf
    • http://tsnpharma.com/upload/files/50601972391.pdf
    • https://jmtours.co/aym_image/files/misufikarasaxuluponojen.pdf
    • http://mcap.cz/images/uploadedimages/file/64583634837.pdf
    • https://xn--b8qxb801j.tw/upload/files/91711075090.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/75843151258.pdf
    • http://zubrcup.by/files/files/28645072869.pdf
    • http://adasbruiloften.nl/userfiles/file/4304808595.pdf
    • http://theclelandgroup.com/img/upload/file/1770213565.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_off0000db63.bin
4675608a74655143ae0d3e1699a55a5ac32ec162433873dafb568e5c347d0b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 21156 bytes
font_01_sfnt_off000112f3.bin
d192b0034f609d3bbdf3e3a992ff0765d7975c5bda3a21f0cf7c315412158fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10564 bytes
font_02_sfnt_off00012abd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 16792 bytes

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