Malicious PDF — malware analysis report

Static analysis result for SHA-256 df66bf36d987c38e…

MALICIOUS

PDF

76.8 KB Created: 2021-04-07 21:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 858ac6f54cecebfb4d9d39673b321ab1 SHA-1: cd50fbef2af308730872c0d3ee6687fa7f61b897 SHA-256: df66bf36d987c38ed64c61c330b17d5cba24d64474b9c5e9d65644542b7aa7e5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jottigo.ru/strik?utm_term=white+tiger+on+netflix PDF link annotation
    • https://cdn.sqhk.co/samofetob/igelhgy/does_she_like_me_quiz_over_text.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/Jibiehd/munulazilafabonafib.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/1651974.pdfIn PDF document text
    • http://spoonnumberone.xyz/bupematarizu662v7.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/aifcmja/abp_news_live_apps.pdfIn PDF document text
    • https://lokapane.weebly.com/uploads/1/3/4/4/134464640/lolakunav.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/ibjdhhd/word_cross_game_online_free.pdfIn PDF document text
    • http://efarbok.xyz/gezowejiwowuxeluf9rmpv.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/1cieDif/fafedusatibonilira.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/5390499682.pdfIn PDF document text
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/5804307.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/173458.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/KgcidYs/zedafol.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/duruxolimo_kepulobamipag_vazususofepoxeb.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/centrifugal_pump_shaft_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/firitogawivirixeb.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/11210600505.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/lodokejilufukukogomadubul.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/94898128872.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/99638125740.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_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 4724 bytes
SHA-256: a0ee07277503221c4a857209ae454de7e1e9eb840351679d039e1f043aac06f2
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 11256 bytes
SHA-256: 3a40ff5d5e33f67e58211ac26f97d371a56b1e7f86c1e0b154db72852654556f

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