Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660dbdce83588fa…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 10:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2967a4d9f6a34b49b3a09c95e9a51f9a SHA-1: 05aea9dda45f3364f4f05ca81a42ae4b09207589 SHA-256: a660dbdce83588fa29dc6aa11656f1917c65b643febcd98e60d84d50ae5ddeb4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common phishing lure, presenting itself as an image to entice users into clicking a link. The embedded JavaScript and numerous external links, many pointing to disposable domains, suggest an attempt to redirect users to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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 https://inwebjor.ru/uplcv?utm_term=minecraft+for+free+on+android+phone PDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/74683921065.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/webawusenoxubibewopakebaw.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/8441872699.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/nasezebomudirafuwabizigo.pdfIn PDF document text
    • http://tecksco.com/upload/files/mekugujukubofotovuzipiku.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/febibu.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/18419004193.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/51461727786.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/nakuzidekumavoligowu.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109151750094227.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6dc799579497996869c0fc9adee468a/butojukojikuwoweja.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/56128921530.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/61922506297.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210909_DA9DAF213B054134.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/sogukefax.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sibiwo.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gurijixilogofozew.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/11973279467.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/faxub.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/kafot.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/vatozelanidi.pdfIn PDF document text
    • https://drlanda.hu/user/file/91679011639.pdfIn PDF document text
    • http://zimmerei-possert.at/tekoxo.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/taboxulologuvo.pdfIn PDF document text
    • http://cartopack.com/Images/file/ruvinamalikor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 14384 bytes
SHA-256: a3add907d74ddb5a01ffe232654e73914221757930110550b11293d05c054fde
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10496 bytes
SHA-256: 3cc4fa002f03ba1b77fc268d8d2e9d515974196e352136d1d220da8dcdf43722
font_02_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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