Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fb256143723666…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 18:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd2c2e34c02218242ec3219549342d8b SHA-1: f34353801c735da61d90f1bb8f8ab0dda8d27b35 SHA-256: b2fb256143723666cd5a46fcf72af89e13d88d09ee0026e71c8289b4a33eb371
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, a common tactic for phishing or malware distribution. It contains numerous embedded URLs, many of which point to suspicious PDF files on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/29078898073.pdf In PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/livasad.pdfIn PDF document text
    • http://szwygs.com/upload/zomuwizokomosodiwudab.pdfIn PDF document text
    • http://totoumi.jp/upload/file/82667739362.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/rabinavadufovakuwopevo.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/76773264662.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/85475573266.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/47906054191.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/58734104450.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/lunijujupidudekazas.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/91398569553.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/wovab.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/dejizerobakomalofoniju.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/vekub.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/89880845045.pdfIn PDF document text
    • http://fitviewer.de/files/file/dadajemi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ff6e5bf8---vigivolulabizaf.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/xaledofax.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/xizamoxixesef.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/jagaxedibabegovuru.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/61782827988.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/88742887751.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/falujinopipomid.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614131f1b7cf1---84690477621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+delete+games+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_off0000b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 10668 bytes
SHA-256: 724f726ac7b4df55b13c5b727b77a8a1119423b80e906bcbc7a87fa3707c1467
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 14136 bytes
SHA-256: 605ed879ff40c20f823a0bf720bc780df53de83c2ad931ce4667d52338788757