Malicious PDF — malware analysis report

Static analysis result for SHA-256 493fec38e5628ce4…

MALICIOUS

PDF

106.5 KB Created: 2021-10-11 02:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a61d87fbcf865ad5f515b11c7382773 SHA-1: fa65a91a3693a1f24fbebfbeecfe372ef95b6550 SHA-256: 493fec38e5628ce47d02db23c043c4f1d9144ee16a06475c2bff3c2a73bcf5a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many hosted on disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://solener.info/ckfinder/userfiles/files/11927952807.pdf In PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/piwilevobitevafejox.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/vumoduvemerujew.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/funinasumelax.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/54878674130.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_6F82DA092AE2B60C.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/63887185986.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/18362606091.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/rolabe.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/radiko.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210912115859_oigcpo.pdfIn PDF document text
    • https://bawauang.com/contents/files/83175259081.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/86998661195.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/64561933603.pdfIn PDF document text
    • http://brukbet.com/user_images/file/nunolajiwupigoxalup.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/pobamebikoneweteli.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/jadugerobuvenerokigi.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/fesetodopapozun.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/36196407091.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/41252264622.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dibudunitufito.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/40755205164.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/mixukadovulogulavepefa.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bumijivatorekelija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dancing+on+a+volcanoPDF 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_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 20680 bytes
SHA-256: 1b0def4a43197f77f4145ce9b1517a605951c087b28196163c4887612a916967
font_01_sfnt_off00016e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001864c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864C 9972 bytes
SHA-256: 75b0c367aa7ddf8c7d5a8317b7acf9f97b01c6257f1a02d74c29ba92c8dea451