Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72fc05db80b555c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 04:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ccf3625ffdaf3e8aee520a7b34d9db8 SHA-1: 14b819640aeaff6e9fe3204198f458959aae4fd2 SHA-256: d72fc05db80b555cb9b78f3e5e35526e0c765c1a782180d5930328bcf21aafb4
154 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document is structured as an image-only lure, typical of phishing campaigns, and contains embedded JavaScript. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7184bdca---225286587.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0253ef3ef225a83fd06409e1d6e9dfa2/kiwajenefodajodonuwonu.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/depuzato.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/nabaruwowarawabubig.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210921082420.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/29690225769.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/50729331337.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/fexuxezakib.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210914_8CDCE5A15BE81CE9.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/fogoxulumiwazaj.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/37969512137.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/bevaz.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/8128936587.pdfIn PDF document text
    • https://fond.ru/userfiles/file/60360832284.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/17277101324.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xulugodunagosanijamo.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/65873002424.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/98164313635.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/48399834330.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kenufirunumik.pdfIn PDF document text
    • http://rayanchem.com/d/files/zuvixoliwujakuwawejer.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/44418173290.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/8072012717.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/zudatuxotimenokotedutuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+speed+up+download+on+androidPDF 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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 14388 bytes
SHA-256: 911514f1cdff2c2b8643ad544e97dc12b8985e0daf00c905953544e85215d03d
font_01_sfnt_off0000d279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 10564 bytes
SHA-256: 5cc0ffdb0f88f0c61e4fc40b31a9c73d32d56360b9830603ab5811287772b187