Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c7bcf4286c9a1b…

MALICIOUS

PDF

76.5 KB Created: 2021-05-06 10:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95f3be76f6f39abf733934e4ea90519e SHA-1: 5726bba5ff5ecd3f9fe1ec48a9c9f073eceae872 SHA-256: 98c7bcf4286c9a1bd49c7e9871e63532a7eb898ff93b9e77a9147705cebfc2d5
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 0.9998

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 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://mezovuduw.ru/strik?utm_term=theta+healing+practitioners+melbourne PDF link annotation
    • http://zevibeponakat.getenjoyment.net/passive_voice_tenses_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/dzgeFgj/electrician_apprentice_jobs_denver_co.pdfIn PDF document text
    • http://tiktoktop.design/destiny_2_forsaken_exotics_guidekard5.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/30306735634.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/44584093960.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/gwWGbhe/7467256712.pdfIn PDF document text
    • https://cdn.sqhk.co/pevotido/gihtSHa/tesopodulajun.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/ewij7jh/super_falling_fred_music.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/RmAhe5B/digimon_rearise_apk.pdfIn PDF document text
    • http://idealslimitalia-official.site/bluebook_cite_book_chapter21tc5.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/CghgiVz/88133168246.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/jgJz3cH/pazonulevidipagefizewatef.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/how_to_prevent_diabetes_with_diet_and_exercise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_fd560342c2014faca3593007848eaf20.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_81a1b8f88ec14d17993eb6fe5b271ab2.pdf?index=trueIn PDF document text
    • http://nibizuladode.onlinewebshop.net/96032828689.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_c4424c4922f64a649d0994b42b339ee5.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_7ccdf3e0f67f40b1aa415903b2bb3e68.pdf?index=trueIn 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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5436 bytes
SHA-256: 7521316c1f1b159980748bda4fc390b468a969287333a5d8a79d62519d08b4ed
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 11584 bytes
SHA-256: 3a632108a7d1c613620490d840ca7bed0d831b8cacba79bec744b949e141d1b3

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