Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cfe429b2f7d7a4…

MALICIOUS

PDF

88.7 KB Created: 2021-04-03 19:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8689c4857eccdcad8125b2c86e08ed6 SHA-1: b337a856a5775aa256ad5ac8d62212ce4a805bd8 SHA-256: 43cfe429b2f7d7a4e1d50eb2bbaf74a4fa5e0d78c3cb616c7bbe65a3e303217c
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs, including one hosted on disposable infrastructure, suggests a link farm or phishing lure. The 'SE_URGENCY_LURE' heuristic further supports the phishing pretext, indicating the document contains language designed to prompt immediate action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/wix?keyword=the+general%2527s+daughter+may+14+2019+dailymotion
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/91c72d4b912656.pdf
    • http://wuwisometojone.66ghz.com/soundtrack_drama_korea_hotel_del_luna.pdf
    • http://zagavexakagin.mypressonline.com/siboxevonowukogekaw.pdf
    • http://small-italy.space/max_lucado_easter_sermons_2020bjmwj.pdf
    • http://nat-fru.space/halfling_names_funnyb7h69.pdf
    • https://cdn.sqhk.co/satidaruxami/ihcggjh/basic_english_grammar_exercises_for_beginners.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/1734136.pdf
    • https://cdn.sqhk.co/zowajomi/c8JgiAa/abalone_pronunciation_uk.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/how_do_you_unlock_a_tracfone_phone.pdf
    • https://jigukijovumide.weebly.com/uploads/1/3/0/7/130740363/0b8341f.pdf
    • http://kijofizovurisos.medianewsonline.com/mimirulumofoxivepekubim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fezadup.rf.gd/sevopotugi.pdf
    • https://s3.amazonaws.com/votuweroxigezog/bumowirosorufolusifefokug.pdf
    • http://ripotuteruposa.rf.gd/yardman_riding_lawn_mower_parts_diagram.pdf
    • https://s3.amazonaws.com/tuxenipup/gorol.pdf
    • http://zeladupu.epizy.com/liberalismo_concepto.pdf
    • http://koxatuvuridotit.epizy.com/who_makes_good_chest_freezers.pdf
    • https://s3.amazonaws.com/lerezazo/feduwalaloripefaloko.pdf
    • https://s3.amazonaws.com/tinezedu/what_creative_hobbies_do_you_have.pdf
    • http://sokekakeloji.onlinewebshop.net/what_is_the_copm.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_off00011c07.bin
ed55d9874e46c243926715c22d5f2c18c2046960cffdeddaa0108ee3e946161e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 5892 bytes
font_01_sfnt_off00012ff9.bin
da26dfd14bce4bf9a4860876248dd816383d21e6e5cc6b0dfd2a058944897dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 10988 bytes

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