Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ec5ca90a1f8c19…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 09:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa64fcc8a5b14d8cbe5c64f0113b241 SHA-1: f1dd8a1f907b4532be6898f63be51068eba84279 SHA-256: 42ec5ca90a1f8c1901169cd7e15bdb8a3e83af16671d5cf1b87372cc1e96f1bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cructi.ru/uplcv?utm_term=collage+photo+frame+app+download
    • http://herbwaterthailand.com/userfiles/files/24756557472.pdf
    • http://telecycling.org/files/file/vedufokavugus.pdf
    • http://hagelkonzept.com/userfiles/file/velerurepajonatetobajo.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/rolutapiludeki.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sedujatajasurogijijati.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ktet52f26vh6emvoeo44jsbc6s/61600337652.pdf
    • https://ajansnigde.com/resimler/files/kilogatid.pdf
    • http://industrialdevices.in/uploads/66989510479.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ca42eeec---xakigemozizaduk.pdf
    • https://nonbodepsg.com/uploads/files/vulubetuwikitaseforuralu.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/97851081177.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/39854337253.pdf
    • http://derkwoo.com/upload/editor/files/25427403581.pdf
    • http://tandartsindex.nl/images/uploads/19151852371.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepinobewijowakef.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/22742528485.pdf
    • https://eletmodguru.hu/files/files/10804226001.pdf
    • http://royalwedding.jp/images/blog/file/46516796918.pdf
    • https://www.stnedu.com/ckfinder/upload/files/nulorudibiduxit.pdf
    • https://dulsuc.cl/userfiles/file/54992726084.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/57718493129.pdf
    • https://futurefacesmiami.com/uploads/file/37616432309.pdf
    • http://jeanchapleau.com/userfiles/file/53929379687.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/45376894614.pdf
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/44896312638.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/legogegeradum.pdf
    • https://digireg.cn/upload/69069889266.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_off0000e315.bin
68d50ddf8f55c9a6162772be37c583af3044ed5baccdb86f26f4a6f7459817a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 18668 bytes
font_01_sfnt_off00011321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 16792 bytes
font_02_sfnt_off00012b38.bin
e4bf3ffbef8fac2a8357a35db35781d466ffec89ba00bf68a898e7ba8c4cb98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 10800 bytes

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