Malicious PDF — malware analysis report

Static analysis result for SHA-256 8244144820cddb60…

MALICIOUS

PDF

98.3 KB Created: 2021-04-03 06:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 78354dda5b6208234db0300535c36bc9 SHA-1: 78b02d4ff61df48dee1017a1dee76905f056fec2 SHA-256: 8244144820cddb60db4881ffdbcdd6159a4e385453067263236628aff4fa786c
186 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs is https://leonvi.ru/award?keyword=carrom+rules+in+marathi+pdf, which is likely a lure. While no scripts were explicitly extracted, the PDF structure and extensive linking behavior are indicative of malicious intent, possibly to redirect users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/award?keyword=carrom+rules+in+marathi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60344134acb87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393364/normal_60014bc651a6a.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/newubizer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_6007b560f2089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_14f78eaa486a4a6898a0866347094fe6.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_7336bf6d8017411d80bead1954ba461f.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_5cb87349ad22433bb3b005680fa5c653.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_a010732533d446089e23b6de369d254f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/wesuli.pdfIn PDF document text
    • http://pexofapu.myartsonline.com/saroparokiridipuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8dc8ed-edb9-48c1-9702-8ba2084799d5/the_taming_of_the_shrew_1967_full_movie_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61875bdb-4121-4498-b171-f49819a0ba2e/napopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd730fac-1a94-4db5-b20c-1d2b402133d8/zijokazenamawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ff0bb9-30df-4701-87b4-3a82af60ba69/meaning_of_teeth_falling_out_in_dream_islam.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/wijipusiserukuzifimed.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/46373823561.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_caa432fabd7441be8cdbbeabc4f3499f.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_e822725a32294f3d87fd416abc3e0609.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdfc786-4eea-4e42-81d2-1bba28fffbca/why_does_my_top_loading_washing_machine_smell_like_mold.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_7a01fd3172ce4c6581fb1028b15a7545.pdf?index=trueIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_834b0e1f5e3f487abb9e8904bbcad241.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/la_chacra_restaurante_arana.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/vampire_diaries_season_8_episode_8_summary.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_ed7c13c2c68643839995f8ffb482987a.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_1da005dc2ff64ab6a591c3baaf106dc2.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_off000145af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AF 5188 bytes
SHA-256: a839e177c32128db352f6d5d11900960d80089de07b005de65325d6f1bdaa86b
font_01_sfnt_off00015725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15725 10752 bytes
SHA-256: 47d386e2e750178a5271927eb3b1e687fc5d9b793202f97488433f21f041d93c

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