Malicious PDF — malware analysis report

Static analysis result for SHA-256 3612509aedd50c28…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 15:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bcbacae7f5e4dbce508715ae484f209 SHA-1: 28d7d478fb1d6fa0d06792957326de464c482514 SHA-256: 3612509aedd50c28d5c8a51781b4ea234f525017162a4c83fc09989fec0d1b2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is identified as an image-only document with an action trigger, typical of a phishing lure. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious content or download a payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mh-gartengestaltung.de/userfiles/file/ketemaripafesixodapev.pdf
    • http://serramentisiciliano.it/userfiles/files/novebuxojuxefef.pdf
    • http://mini-garden.ru/userfiles/file/33257325764.pdf
    • http://ct-tci.com/cttax/userfiles/files/nifinosab.pdf
    • http://thepokeluau.com/uploads/files/26260424083.pdf
    • http://exmar.it/foto_fck/file/biropumukofajosid.pdf
    • http://thienthaopc.com/upload/FCK/file/wonotobesi.pdf
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/5743652691.pdf
    • http://maristaslardero.es/userfiles/file/23732419439.pdf
    • https://farmaciasacoor.com/site/upload/file/26832142091.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/69089974495.pdf
    • http://curry-box-deluxe.de/userfiles/file/21934750708.pdf
    • https://il-gusto.com/images/file/16889829109.pdf
    • https://pleasanton.com/wysiwygfiles/file/63295090239.pdf
    • http://liga-stf.ru/i/upload/files/35080727691.pdf
    • http://peak-experience-japan.com/images/blog/file/bimojakizejowami.pdf
    • http://vattuxaydunghl.com/userfiles/file/56234965488.pdf
    • http://baiduvpn.com/upload/files/88470382808.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lifezugigejawaxoliseputap.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/72835253435.pdf
    • http://hatowo.com/app/webroot/uploads/files/55128779182.pdf
    • https://efckrakow.pl/userfiles/file/nuxagakosugajez.pdf
    • http://seteo-dechets.com/images/file/93053512096.pdf
    • http://hotelbasantresidency.com/uploads/88125508357.pdf
    • http://laskod.hu/userfiles/file/mowefuratowumo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+video+on+snapchat+without+holding+button+in+android
    • 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_off0000b141.bin
d1a0487fbfd01ba1f369dcef24b3daed8d8a5a158ef0bfbadf424b603370ed25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 11436 bytes
font_01_sfnt_off0000cb9d.bin
36a148afa8837ddb310928dd7983f168cf19b4ab8dfb23026a7fe5ef76b05734		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 14460 bytes
font_02_sfnt_off0000ef61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes

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