Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4ffb8c9b6da1e3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 16:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 479c97db616f33f9d282dc8843ccd68f SHA-1: eae8a8413891c031aabfb6a8f4b4968f9bbb7d1d SHA-256: 6e4ffb8c9b6da1e3d882517556a0900b1eafa2c32df45be98636d3b97319a917
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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 http://pogologistics.com/ckfinder/userfiles/files/65134972963.pdf In PDF document text
    • http://doradcyprawni.com/images/pliki/wilojuwikoxifupasifofasu.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/51004382091.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/japubo.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/petotugebugegepivedi.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/55707895546.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/wiloxoputizimafaboziduro.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416a7d9dd22---64445512843.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/83950889200.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/21974421740.pdfIn PDF document text
    • http://djapm.com/userfiles/file/65955445485.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d0b82161a739aa62d243be14bbf86f76/wejunolatusi.pdfIn PDF document text
    • http://arablift.net/userfiles/file/97307552462.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/81483948574.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/16896145983.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/75230834348.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/41382093823.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/67194812525.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/lunuxuvo.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xetomomizumeji.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109110348443719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=taichi+panda+3+mod+apkPDF 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 10464 bytes
SHA-256: 40203c5dd0d21925d1667f1dbb0edfe182f93bc0c9b652f06459e4ffb4553911
font_02_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 19372 bytes
SHA-256: 1b88a2f27eb16904557e610d9a186060305c7e5294d5988488f992702d716bfb

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