Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46403779f4dcee8…

MALICIOUS

PDF

77.5 KB Created: 2021-05-13 23:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b67f5b5085c0eca57c747508a447a7d4 SHA-1: 7bafd5b7d79a922587ba77040efff03275d5d43a SHA-256: f46403779f4dcee87760d5fc5295775d49739120b18ff0b1900d865b2833afa7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, many of which point to disposable hosting. The primary malicious URL identified is https://zajinet.ru/strik?utm_term=resumen+corto+de+las+medias+de+los+flamencos+de+horacio+quiroga, which is likely used to redirect users to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is designed to facilitate the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=resumen+corto+de+las+medias+de+los+flamencos+de+horacio+quiroga PDF link annotation
    • http://tozemudezajif.mygamesonline.org/46969652628.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/how_long_does_it_take_to_be_approved_for_disability_support_pension.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/i0Ohdih/lawn_tractor_into_go_kart.pdfIn PDF document text
    • https://cdn.sqhk.co/pupewudoj/Bzahb7T/15028003441.pdfIn PDF document text
    • http://rumulive.iblogger.org/gerewaxisu.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/7uheElU/77408539251.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/middle_east_after_world_war_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/UxjdOja/logis_tycoon_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/83Smaqg/my_pillow_reviews_and_ratings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_ab3762e2ffee465aade2ef396edaefba.pdf?index=trueIn PDF document text
    • https://2634c7da-0b58-4de1-95e3-ef2217a723ee.filesusr.com/ugd/f934bc_5290d9ecd67842848a38b38b66f65538.pdf?index=trueIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_5b4b14af29c54ec5b0eab85e850f8d74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/analytical_methods_validation_guidelines.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_25320f66bf1a442ea1b08f5b80f97e4c.pdf?index=trueIn PDF document text
    • http://gibegedagaseri.epizy.com/wozijabobok.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/surprise_50th_birthday_invitation_templates_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/lojapoketig.pdfIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_8208bc14091640d99f74ecfefeff8766.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/codeware_compress_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/machine_learning_engineer_salary_san_francisco.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_79897066078f49b48555e2183cf95e18.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_2b48e6db2e484449a24890ab89bad104.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_dd65e2d4e6064b37bf55b20a711c5b0c.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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5568 bytes
SHA-256: 36cfac6e524fb16272053fa9bab7ca113e3cd0dae5a62a4e3103d1d6c5bf93ba
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11612 bytes
SHA-256: 8e2b710187c2693808f85942a4bda0c86a241ca5414a60f9d688b7022b606c51

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