Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e835b1a3e2990fe…

MALICIOUS

PDF

95.7 KB Created: 2021-09-17 02:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2b58d27b42f39fa0675831e3ded581a SHA-1: 32c118558e97cb36f998895dbe9cec1818c138f8 SHA-256: 8e835b1a3e2990fe96f8a0c53db20b7546db0444c48781544100eb6b9b11cbf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=melhores+rpg+android+2015 PDF link annotation
    • https://pmfegypt.com/userfiles/files/gusadamutozaxufixagoxufej.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae4b7a4e4---jupelibojabez.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/19739511024.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143c56f64a52---bilarataxawegifil.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/76551545740.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/lolodepa.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/89135499827.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/rulikafexupoganipovujibe.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vekefemimijerunufudugofa.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/80669480343.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/zamilofidogufe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wumumep.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97681812455.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/kofidalodonimowilifuxagej.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/32641358570.pdfIn PDF document text
    • https://phnews.ro/files/file/70633887782.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///26379677114.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210911_8F9874E8B9F81B0B.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/16391590445.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/renejodenugukagugoju.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/terujofev.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/43162667293.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_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 10992 bytes
SHA-256: bb95b876e20054739d43fea1d2ab7ab4b2f81fc9b16bc04e5f2f277f569b7dd1
font_02_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 19400 bytes
SHA-256: ddccda6ee498170034c190823c6931283a98ac6bb2297861f629d68068fa4de9

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