Malicious PDF — malware analysis report

Static analysis result for SHA-256 28681080fde4730e…

MALICIOUS

PDF

75.9 KB Created: 2021-04-26 21:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b90f87f18cb443dd66b7d1c588594e98 SHA-1: eae43d0bb3b6b43717fb9c45cb54886d8f2ed294 SHA-256: 28681080fde4730ed2f92a45484f076d7498b8a9a4cab76305ee70ac0ea6d6d1
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to potentially malicious or unwanted content, with one prominent URL being `https://dugedepap.ru/strik?utm_term=charles+kindleberger+manias+panics+and+crashes+a+history+of+financial+crises+pdf`. The document's structure and the presence of numerous URLs suggest an attempt to exploit search engine optimization techniques to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=charles+kindleberger+manias+panics+and+crashes+a+history+of+financial+crises+pdf PDF link annotation
    • http://vuzomubanaj.22web.org/english_grammar_articles_examples.pdfIn PDF document text
    • http://selavaxanunuv.iblogger.org/best_android_games_to_play_with_friends.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/bapipe.pdfIn PDF document text
    • http://vivoxasoro.22web.org/46924006638.pdfIn PDF document text
    • http://pubolovuwete.iblogger.org/boeing_777_cockpit_poster.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/51402396642.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/86015877907.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/fefobe.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/sopisulivizutifagur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_391ff03f56f3452dbdcc499e3077bba0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/can_i_use_my_iphone_as_a_universal_tv_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/suxesozalid.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/consumer_reports_air_purifiers_2017.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_8915bb71e7f046d598f916caaea69782.pdf?index=trueIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/biophysics_and_molecular_biology_pathfinder_download.pdfIn PDF document text
    • http://nugifola.rf.gd/8440952395.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/peavey_bandit_65_amp.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/2071515727.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/91880317881.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/dabovofif.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/key_largo_marine_weather_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 5780 bytes
SHA-256: 87b16f571d3b053eee7c399493adc762d8606a2b9fe473836481d4d6fcdfc531
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 10844 bytes
SHA-256: 29a375fbaee46ab07f203a210022353a90c1aef9a4f74f5bd73892a0eee4aa5b

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