Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a7426fd5ad8cb2…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 03:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1537efeaf8a34562760c1ec7ee0ec99c SHA-1: 210c7e6d706c175600c724c59afb9c9c69238116 SHA-256: c7a7426fd5ad8cb28be74209bead0a8294347c77c44bab82571a562fdcad8917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a link farm, containing numerous external URLs, with a significant number pointing to disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external links suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://kuzutuzo.ru/123?utm_term=haier+portable+air+conditioner+filter PDF link annotation
    • http://kujunat.medianewsonline.com/munisabezon.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/033b2fae175.pdfIn PDF document text
    • https://zipadufemawosep.weebly.com/uploads/1/3/1/3/131398243/65fb632e.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/tajixani-xamexo-laruduxe.pdfIn PDF document text
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/bidadov.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/latikawipuxutav.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/godoxudaxaros.pdfIn PDF document text
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/2431503.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/dekotibisiki.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/afd36c98-5b93-4f53-afba-3bd44cb45630/resixaninufimusibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fc9da0-254d-4448-a4b7-cf44a0174761/example_of_a_research_proposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b26f347-a567-4064-b3d0-ee96a74f1bb3/what_is_multivariate_statistics_course_hero.pdfIn PDF document text
    • http://demunoj.epizy.com/jasiruguxexero.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/safewatch_3000_change_master_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29802c7d-eda2-4a20-8aac-d9a1bc18c8e4/english_book_store_berlin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031a3223-a5d1-49b4-a508-ad691465a728/harry_potter_and_the_sorcerers_stone_summary_chapter_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d5938c-5e10-4e62-bdfd-e95af3152d9f/sodose.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/dsl-2750u_firmware_middle_east.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13ee8e7-56e4-4a07-b078-abf5f6f2b88c/double_down_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4bf399-e6d8-4fc6-a8d1-be08b62fb93b/best_drawing_books_for_beginners_reddit.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/85748806871.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/zajozugazejodagugi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 5072 bytes
SHA-256: 66ddb40a2fbc7a29b3f392b8e4483b7248b4ccf9d6390bb266511c93890a1e15
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10608 bytes
SHA-256: 67cb5afee223810e55a26cdac2e704a1779c45c30d8979d13d2e8ed2831cead0