Malicious PDF — malware analysis report

Static analysis result for SHA-256 c678c364b3c8ba8d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-31 10:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d133aaf64b58aac1bda340357343fe7 SHA-1: 71fa7ce48f40c43c8cb84bf2556a17054cc11109 SHA-256: c678c364b3c8ba8d857d9980a18ca137e7058280351e6e7c31100aee6cb3af85
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=holy+bible+niv+version+apk PDF link annotation
    • http://puvinizozibejir.mygamesonline.org/kevixifujuvovuxewoxitaze.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/5_examples_of_figurative_language_in_the_highwayman.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/zuledosevobinekelorisap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_6063948e832ba.pdfIn PDF document text
    • https://vipogonegope.weebly.com/uploads/1/3/0/9/130969266/941209604d57f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6057bf576fc6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_605adcc4b0498.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/9992526543.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/ctet_answer_key_2020_paper_2_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_5fd66065ba7c7.pdfIn PDF document text
    • https://giponijas.weebly.com/uploads/1/3/1/4/131453823/bemesulile-zebenenabutiv-vurugovix-bozadejukinu.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/6172011.pdfIn PDF document text
    • https://favekenada.weebly.com/uploads/1/3/0/8/130874403/5484330.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/xunilukegez/vba_cells_function_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/what_sentence_structure_can_an_author_use_to_create_a_sense_of_urgency_in_a_text.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_ac2ca5b567e74aae88a91ada34d2bae9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/27301899374.pdfIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_88f7d4c31dce426b8be4637c5aa782d9.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_943a9b2f5df84dc482ed30db3840bd1a.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_beac92177a2c4b5eab8d8e0402a5077f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E8 5140 bytes
SHA-256: 9a7cf9605761ae24355366b13ce63cfdbc643bcfa62ad06453c86b3110cc56bf
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10664 bytes
SHA-256: 27fa69596e2cba4512353dc79f8965ab9d73fcb35551667fb6d77128068631ca
font_02_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67