Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa143622be29bd5…

MALICIOUS

PDF

82.0 KB Created: 2021-04-15 21:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e7221139ac19631b92c9a22a43957e SHA-1: 73eff1c907d48a494cba26884681e98aa5fe246d SHA-256: 9aa143622be29bd52cb3c5425efaffb666f2f8fef6fe1caec555c737d5577253
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The document body, though heavily obfuscated, suggests a lure related to song lyrics, which is then linked to a URL on disposable hosting. This indicates an attempt to direct the user to a malicious site for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+is+the+song+id+for+savage+love
    • http://xojitufos.66ghz.com/30516737359.pdf
    • http://rinetiwirejux.iblogger.org/bhagavad_gita_gita_press.pdf
    • http://jisurokaz.22web.org/31449776778.pdf
    • http://dutivozupofamap.22web.org/streamline_english_departures_download.pdf
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/0d4e5d17c.pdf
    • http://sfr-webmail.com/7099207675324y1h.pdf
    • http://sakabeg.iblogger.org/44456368393.pdf
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/kivuwisazut_mugadejiw_kuvevawazab.pdf
    • http://bipiraxas.iblogger.org/76748613995.pdf
    • http://steh-sistem.ru/benanikimokizulibixgb0e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74c8901d-608a-4131-afd6-8524013c0916/spring_4_tutorial.pdf
    • https://s3.amazonaws.com/tuxenipup/rubetibuzugejavijusar.pdf
    • https://s3.amazonaws.com/jinabisura/77058085054.pdf
    • https://uploads.strikinglycdn.com/files/b11e1706-70d5-403c-bfa7-10caa39bc562/60433117132.pdf
    • https://uploads.strikinglycdn.com/files/07ea9d0b-5ba6-40c2-92db-329902d98a4f/conversin_de_gramos_a_miligramos_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/d74ce600-82a3-4ab8-bbca-39fc3feebcf6/kuvavovagobujivowo.pdf
    • http://litopuputorer.rf.gd/vegodomenixutomuxofetem.pdf
    • http://pexoroxijaseduj.rf.gd/change_file_size_online.pdf
    • https://uploads.strikinglycdn.com/files/c0d8ed12-b45e-41de-a593-b7447d9befd1/sebesaxijusi.pdf
    • http://tujefozumuresul.epizy.com/goramakev.pdf
    • https://s3.amazonaws.com/diwitapezu/hockey_game_rules_and_regulations.pdf
    • https://s3.amazonaws.com/vuzufexarevima/gupizorudipezedufezogitaj.pdf
    • http://lajirobodogew.epizy.com/gta_vice_city_android_mods_no_root.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_off000103b6.bin
9896c5df1458fccf312ac42472e77db0f495d292659866b8b3b656d716f7b300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 5240 bytes
font_01_sfnt_off00011599.bin
b1176da57de1b22216ed0acfc962e7904d1e04c001ccc2ecfc68c4d7916fa8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 11040 bytes

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