Malicious PDF — malware analysis report

Static analysis result for SHA-256 68391cc63c393444…

MALICIOUS

PDF

68.4 KB Created: 2021-10-13 19:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38a03b236741c8139e87acec2b9f691b SHA-1: 2809360e574067b330e026de6f05eb3ca690e67f SHA-256: 68391cc63c3934440496f4c318829cd25c73fb874f293dede0d7e8a4b41e13ef
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. Heuristics indicate it's designed to trick users into visiting a URL, likely for credential harvesting or further malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://thedewakohchang.com/image/upload/File/ibegen.pdf In PDF document text
    • http://studiosiriosrl.it/userfiles/files/75063025795.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/jupitunomiti.pdfIn PDF document text
    • https://10s317.com/uploads/files/202110011136165358.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7f95d2ab749300c028bf9db208f2859/falifavokozarug.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/36722147111.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/zubiwigakab.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/65199977454.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/92666584176.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/15491018768.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/94281756791.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/8137797764.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/96308398775.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210927165355570125zkxtf.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/tizerajomugi.pdfIn PDF document text
    • https://abcspain.tansis.com/userfiles/file/sarujagolemefava.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/limadena.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/16966302397.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/1736926557.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fopezajifil.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/85523006151.pdfIn PDF document text
    • http://jfe.hk/userfiles/newelurulukumaruwefori.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/63953253451.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/85224867213.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=quiz+questions+on+stock+market+with+answersPDF 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_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 10992 bytes
SHA-256: 89257490864cc1a673c5cde33a4f8dfc5c963344d009b777505694416e7b4a01
font_01_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 14312 bytes
SHA-256: eef5e48e0a1d4a274a6eb8e2b76b83a03495035d9de26506a8d4624f7260d870