Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e99be01c416284…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 18:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71875b693e91827ba1b0dfd9f8258dd3 SHA-1: 0007b6d5f8a674904eeb986e1054803bbe2be3ac SHA-256: 68e99be01c4162841272c9d516caa05d59a0fb5fb8048d93170d8eeb4b8eb6fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this deceptive linking strategy. The presence of embedded URLs suggests an attempt to direct users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=play+store+update+apk PDF link annotation
    • http://peter-crooks.com/userfiles/file/suxatosiwakigefuvera.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109011559042392.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/kenunuxatapidezozizuwuguj.pdfIn PDF document text
    • https://wittnebel.dk/file/xogobifif.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/buxuginepidupiroduzamaxim.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f330f93f89---datutebewinezosovekadojal.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161351bf144173---89154082928.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/35585864816.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/pevukawisesizitutekedaf.pdfIn PDF document text
    • https://norservis.cz/files/files/91443019346.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/84408352768.pdfIn PDF document text
    • http://annabarons.lv/files/files/dulapuzazufelidifu.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/64149973383.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/77681251768.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/kapowata.pdfIn PDF document text
    • http://st03.it/userfiles/files/28724208470.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/giripemi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/kuzetunosemonumofigo.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/divedukote.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/refagivovodosoxipumeliga.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/86179051427.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/37808544267.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/3775693011.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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 10496 bytes
SHA-256: 7173e61abeeb0c236f199a76b012994e253ce18377fe6e4a189aee51637b5101
font_01_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 16572 bytes
SHA-256: 14705c7c677b3be7cce246caa180c9a416daeeaa3ced963f5e33f0d421533424
font_02_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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