Malicious PDF — malware analysis report

Static analysis result for SHA-256 204beb4c5f6e8076…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 20:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0029ada0d5475e0c0615f97a86218580 SHA-1: d9f1416dc5e612852ff799d54ed57a6074b8cc74 SHA-256: 204beb4c5f6e80760d3f1ffbd42d94cccf80336c4747b690c0ff4776d4ba1c86
174 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript and numerous URLs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://pistant.ru/uplcv?utm_term=blooms+measurable+verbs PDF link annotation
    • https://beysukonaklari.com/ckfinder/userfiles/files/gokubu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/mokivuxiretopodadatut.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/sudinegulikikapiponiwuja.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/gelunotipile.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/notunovobukiniguzageruzo.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/51451134884.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jisafinijejareduto.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/99131368614.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137195498fe6---73706393095.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/37371368957.pdfIn PDF document text
    • https://telorgabus.com/contents/files/kajuvemigif.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902025156.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/pifozisapomusani.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/59067437690.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/texazuvaki.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/lakavujaxirosak.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/37436577160.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/vupazolovefukuj.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/70244717678.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e12f57c853---nusotaviledokinoz.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/53653056591.pdfIn PDF document text
    • https://rainwater.cc/images/uploads/files/71259229561.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/11/80646493221.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/25330363689.pdfIn PDF document text
    • 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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 16112 bytes
SHA-256: 1f4d293f6130ce43e1edb290c63ef452f86aaea35aabbd3575dbcde44abaf7f0
font_01_sfnt_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 10332 bytes
SHA-256: 8ef13287185069a2a32b6b7153ec6ae91708ffaa0223a1b39b4694d9215a6c3c
font_02_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1