Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e43ae630158093b…

MALICIOUS

PDF

86.4 KB Created: 2021-05-09 13:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8418335d7aae9075e119421d22dbfcb1 SHA-1: ae315616c6d3085040d6863daaf930c7844c5a9e SHA-256: 2e43ae630158093b24d493bfaec89b3b06d09f8ac07479f03c0c1f52db649cc4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=how+did+most+millionaires+become+rich
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/8d16767.pdf
    • http://itrom.fun/marbury_vs_madison_case_briefflmjf.pdf
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/zuzosuvepizorulujar.pdf
    • http://dipijefowisadu.iblogger.org/whats_another_word_for_natural_selection.pdf
    • http://itfamily.info/football_team_manager_mod_apk1njmd.pdf
    • https://pakitaxe.weebly.com/uploads/1/3/4/3/134318313/zufuxapinuda.pdf
    • http://vinnipoh.fun/memabafesirogogifwm6q4.pdf
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/rapijizetujuz_gosigosudid.pdf
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/pulotijinukab.pdf
    • https://biwemazisemu.weebly.com/uploads/1/3/0/9/130969041/dudade-jifowegufudaf-dalimovul.pdf
    • http://wusodopepufex.66ghz.com/89325336831.pdf
    • http://sipamuxagiporen.iblogger.org/95393344101.pdf
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/edde918d353.pdf
    • http://iranomics.com/geganotunvpoeo.pdf
    • https://kazeroxunixon.weebly.com/uploads/1/3/4/8/134885145/8403419.pdf
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/kelilamojosufat_ditojejov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pozonijegexovu.epizy.com/72320663510.pdf
    • http://dibulazovila.rf.gd/icloud_backup_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/6b3674f6-1fa9-485e-af39-7642e3c3bc3e/how_to_program_johnson_controls_a419.pdf
    • https://uploads.strikinglycdn.com/files/81293650-c660-4649-a580-38055d5e64e4/18368598134.pdf
    • http://liwununigu.epizy.com/anker_liberty_air_earbuds_manual.pdf
    • http://mowelafawugek.epizy.com/best_travel_guide_book_new_york.pdf
    • https://uploads.strikinglycdn.com/files/14f6bb89-0bb8-4836-a1cb-273f899668ca/fenedozezasuvab.pdf
    • https://uploads.strikinglycdn.com/files/ba6a16fa-b769-42aa-8679-5d89d6fb899e/timeropubifutefuwejozud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113cd.bin
37d8c59989280c6e7ba70d5df84a17ea9f8879603df6085988fc9e27dac73ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 5372 bytes
font_01_sfnt_off000125ef.bin
5b11b6f306bcd08de0f8902be556e6c3d29f51492fdfdf81f0061e19fb5d5c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 11072 bytes

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