Malicious PDF — malware analysis report

Static analysis result for SHA-256 3482ef0b3e5d3910…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 09:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 123c3696872d24c81d2cb9c9da87526f SHA-1: 4dd55181010d5ad2d702a4613109fa47772e080a SHA-256: 3482ef0b3e5d3910755b232aac4b03b0b7b0837dd15ad362702c19d338576d32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=geometry+dash+2.2+full+version+free+download+android
    • http://haohanlegend.com/Uploadfiles/files/jatofamemuwuwebab.pdf
    • http://aceonlinementors.com/userfiles/file/sinulutofowibemomakusom.pdf
    • https://reha.bg/content/upload/file/vajemajexagevobodisowisoj.pdf
    • http://softtox.pl/new/userfiles/file/62184616428.pdf
    • http://www.extramas.com/userfiles/files/watazikedixu.pdf
    • https://2b3la571ga-70p.com/contents/files/simanesegasatekobad.pdf
    • http://mama-care.com/UserFiles/file/53750609915.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/futitokekebipujik.pdf
    • http://goldstecq.com/userfiles/file/50119867978.pdf
    • http://unibox.lv/files/text/39514113035.pdf
    • http://reylab.com/userfiles/file/damalovesobaduwezasopode.pdf
    • http://magendans.com/imagefiles/file/87503940555.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/86208627091.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614588156bcc4---vimapegujejariwamigove.pdf
    • http://cbafjvn.com/uploads/userfiles/file/923320214.pdf
    • https://luatkhangthai.vn/upload/fck/file/30276837836.pdf
    • https://berettyotv.hu/userfiles/files/luvafarolozex.pdf
    • http://rowerowaszkola.pl/imgturysta/files/16310703102.pdf
    • http://kirilmazbardak.com/userfiles/file/kegobolaxipo.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/guxemurebuno.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/27297651320.pdf
    • http://pivotal-technologies.com/userfiles/file/38711845846.pdf
    • http://www.jindatunnel.com/up_files/file/83983193794.pdf
    • http://daechienglishpark.com/ckfinder/userfiles/files/56479192493.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/85423638951.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_off0000e6ac.bin
9bd23a11b68ce9a3baee767b6678716aaf511402df3fe14c5a8360cdaf130d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 18868 bytes
font_01_sfnt_off000117c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 16792 bytes
font_02_sfnt_off00012fd8.bin
0629294e0374689807b41edff61aaefc154b6ba7528fcd893b1ba21d345fc7ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 11212 bytes

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