Malicious PDF — malware analysis report

Static analysis result for SHA-256 8396f31d4215f168…

MALICIOUS

PDF

85.2 KB Created: 2021-04-19 08:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 357a78a5fbd42437da34236c6e6a5956 SHA-1: 23933f676ad0f0a5f53855617b93623b3c4a844f SHA-256: 8396f31d4215f168f423e782b7e48f3367cea6d1bc1c10cb85b94b2ed020199c
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one with a UTM term suggesting redirection, and a heuristic for a link farm on disposable hosting points towards a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=rehras+sahib+full+path+written+punjabi PDF link annotation
    • https://buxogenawake.weebly.com/uploads/1/3/5/3/135385170/5188424.pdfIn PDF document text
    • http://trynutra.shop/options_futures_and_other_derivatives_10th_editiongod0f.pdfIn PDF document text
    • http://chatik85939775.fun/guradarunuzonovorofujadixz4.pdfIn PDF document text
    • https://feriwixuwegixuf.weebly.com/uploads/1/3/4/6/134602873/xewelusabisuvilif.pdfIn PDF document text
    • http://appless.space/flatland_edwin_abbott_freezfudn.pdfIn PDF document text
    • http://dalnoboyi.xyz/nekurerulajasakebulires5yje.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/d94613ae116fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://beparojolen.epizy.com/hogwarts_castle_map.pdfIn PDF document text
    • http://kewugozosefo.epizy.com/duxurijora.pdfIn PDF document text
    • http://pekanob.rf.gd/tricare_prior_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/ctvnews_toronto_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/mean_median_mode_range_coloring_worksheet_answers_key.pdfIn PDF document text
    • http://sulovibox.epizy.com/53978577372.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/deposit_slip_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f372c51-acd8-49ad-b3c9-d26be620a43c/95052801551.pdfIn PDF document text
    • http://refewededuxita.epizy.com/77630171601.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/xineram.pdfIn PDF document text
    • http://pazugovaru.rf.gd/selaxe.pdfIn PDF document text
    • http://zimipasazodid.rf.gd/62220417442.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/bridge_building_games_for_pc_free.pdfIn PDF document text
    • http://zosuvupetod.epizy.com/44149496377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e73294-dc03-49db-8570-efd79119abee/8814872527.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 5304 bytes
SHA-256: f0d7a6e25c2e8c118ad6e15815b953c5a5b92d9b7c27132d6a39722b9948e2c1
font_01_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 5472 bytes
SHA-256: a404633b07b8b88821632506e7389fe2f320746f0a86f4557e3cb245725b192c
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 12076 bytes
SHA-256: 536832297daea7aaedcaaad3d6e7c64f4edd98d9af9f49eb9433ef95daa0203e

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