Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e87c726ff16274…

MALICIOUS

PDF

83.9 KB Created: 2021-05-29 11:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 692a53b02c7550b67769ff7bfaf23e09 SHA-1: 59646833e5b82a8f48f4c9f278f9070f2e20a5ac SHA-256: 78e87c726ff16274d63a09729295cb2f810a89668622e20b55a84538e3d610bd
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+insert+a+tick+in+document In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_6066b74dbac9f.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/farakodonazov.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/pafetujenuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_600da309c9d45.pdfIn PDF document text
    • https://bafosuronam.weebly.com/uploads/1/3/0/7/130738527/72de1550a6a5d17.pdfIn PDF document text
    • https://wozovogunetip.weebly.com/uploads/1/3/5/3/135396590/wuwafat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5ff1df42cf1b5.pdfIn PDF document text
    • https://wasafigazepez.weebly.com/uploads/1/3/4/5/134586721/263693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_601b1ce813d1f.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/4555434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_601f538c69772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fcf49fb0dd88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fe1373436136.pdfIn PDF document text
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/6067407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/479183d0-56c5-4420-b89a-58f1b0cbdc97/53212631195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9b8452-aba6-4eec-afa7-28488c005d45/how_to_write_a_resume_summary_statement_with_no_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4010a68-77bc-4c8c-aeb4-e868f5a5f95d/bipumijum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14f83ea-fe15-4dc6-b012-a5fb5aede24d/79253865317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddd4f82-9d87-4850-b1ae-a98f45e08032/market_leader_upper_intermediate_3rd_edition_answer_key_unit_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec00c9f0-9afb-4f9b-89af-ca115a6d06e9/zemerebud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982a686b-ed74-41e6-aadc-e9cbcaeebd29/27377725175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6575749-fdf7-4caa-b719-bd9ddd4f4fba/19349344912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d072f715-0d46-41a2-925e-7a466bc13561/vumadezidevazobixupa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 5172 bytes
SHA-256: 943ea5f6249acbe49ebb0f9435fd390ae4338b50de692c304663953c440c0196
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 1840 bytes
SHA-256: fa0fb8c93ebe20be3d8d3e7ff5a89564f241d888585bf9105aa2b3415d03ef78
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10984 bytes
SHA-256: 91ef5ba5a0d14e06d7600be78879606fc90c2bc745b986f4eba5c5005aca8ae2
font_03_sfnt_off00012ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 16484 bytes
SHA-256: 32d1ebb89f38008d07b37c6770d4d566cb3bf224fd992f04616062ca863524cc