Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac23a0fadc7174c5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 14:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5497fab2e9a3aa848832717d2a6977db SHA-1: 62b22a84119c5dc5ee94048332e5e4ade1620c5f SHA-256: ac23a0fadc7174c5da873c2bb5366d7f9aebe90878c3bc8f5af3b74cf661a274
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing an image-based interface to deceive users. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 68 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://poiskvod.ru/images/file/nabubimalojaxu.pdf In PDF document text
    • https://btcauction.vn/hinhanh/file/19259387954.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/99902209802.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/5912317339.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/muzexodexojijiv.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/dukavozirakikopubajur.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/88282464522.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/57714426567.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161422841c950c---93617324710.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/nusirunutejulosofo.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/29051978039.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/90665146506.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/56406216033.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/fipemuzejilopemuvodap.pdfIn PDF document text
    • http://hocomesun.com/upload/murulilusowevubibirewu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/63342512534.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/62104377702.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/zofavarapopokikefe.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/wivoxedisenekiberuvesul.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/8006682780.pdfIn PDF document text
    • https://paramourpourbebe.com/userfiles/file/76308718439.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/laxefepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=central+intelligence+full+movie+in+englishPDF link annotation
    • 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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 10980 bytes
SHA-256: 8096c44ba371638ed3fff978ef40c520bbea3bb8d926bd7c77e9f8bdd2683143
font_01_sfnt_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 13908 bytes
SHA-256: 4fa7f7e2fbd5682a4a301123dbce2b0e139ff3f70380547dafe409fb2ed32231
font_02_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1