Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd9d85faeb3d3b1…

MALICIOUS

PDF

99.2 KB Created: 2021-10-15 21:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4245a33a0ab0aedba94879646fb77af4 SHA-1: 69d255e15d5e97ee7e3efffc664f5c7e392f991d SHA-256: dfd9d85faeb3d3b1e2cace32d5d7450239018c7c2f9fe73fc2e387f40ac979c2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to disposable domains, many of which are identified as a link farm. One of the extracted URLs points directly to an IP address, indicating a potential attempt to host a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://belstroyiz.ru/img/file/36898857082.pdf In PDF document text
    • http://www.moyekolodin.com/files/nerubuwebig.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b730dec5---510076378.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sawikivimagijegilusakapo.pdfIn PDF document text
    • https://wildnaturetravel.com/File/798333288.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/66243913438.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161629d3eb83e6---83481744873.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/78824110573.pdfIn PDF document text
    • http://df-2.de/images/daten/file/9036483405.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/kedazero.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/ludarokix.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xudorazu.pdfPDF link annotation
    • http://forma8.kz/ckfinder/userfiles/files/42650000381.pdfIn PDF document text
    • http://riviera.az/userfiles/file/62333728398.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/77313186232.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/jinuzobumefa.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/wategotezejirirokose.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/kibawudob.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/53678769012.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/37706144742.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/wugixopolesisojobalelorem.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/44546946617.pdfIn PDF document text
    • http://farmina.ru/uploads/files/19361501718.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/rugoxakekamesixenumofoge.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=elements+of+chemical+reaction+engineering+5th+edition+solutionsPDF 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_off0001174f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 11140 bytes
SHA-256: c1ea106c606ac801bf191aa1a9e6d616167d04df046b0d7abdaf3792d777caf5
font_01_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 20792 bytes
SHA-256: 07c32abb222795ddf9a9c286002d4b283b6b43097fb213b0a8ef57f232a4895e
font_02_sfnt_off00016682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1