Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0f88965450495a…

MALICIOUS

PDF

70.9 KB Created: 2021-04-05 04:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 24a6fdc23d30d9ced7ff2c858b5f073b SHA-1: e71ad114fd1abc0884d2086227df516015622fa2 SHA-256: db0f88965450495adf316699a761aa82aaa1737f1ec6636e7f56b19fe300894d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary function appearing to be directing users to potentially harmful content hosted on external domains. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it could be used to deliver further malicious payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=worthington+swim+club PDF link annotation
    • http://urott-hu.com/55742453760whinb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_605b07e83f8e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_5fd787b7609cd.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/giVisik/lego_dc_comics_super_heroes_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fe7c7e8f2a77.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/c5JXghK/forex_day_trading_strategy_books.pdfIn PDF document text
    • http://genoray.pro/micro_expressions_book_malayalamla9ww.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_5feb012a36082.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/kiJhPgd/muwabetalozexomu.pdfIn PDF document text
    • http://winoorama.site/how_long_is_harry_potter_book_6dp9pd.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/52tLxgg/las_vegas_casino_slots_play_for_free.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/23978727-6f52-4555-8ad7-17c932c55edc/mastering_essential_math_skills_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9fc2a1d-2870-480e-991b-2d116c85e960/fawulebu.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_f8b8791a395e46548b2f4191c355b3b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ecb08c-10e6-4925-81e8-f242a1072b06/xudus.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_f4cfe002083c44d39158d9845bc593bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29508d2b-8268-48f0-a262-2c86d097f83e/1596356951.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_a0e8e9cb8c244cc1a7d0588ef1858c55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92be6f6b-2e87-44e5-a7e6-3cf890a99f32/31327533856.pdfIn PDF document text
    • https://f50ece36-1901-4a7b-9396-968a400df7f4.filesusr.com/ugd/3ecb95_59303736fa104c408387710d53e2a269.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3eafaf-711e-4e1d-b647-dbf26c5178d0/cant_get_liftmaster_remote_to_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e5c4b9-e9a0-4a64-bdba-5eb565ef7262/kamaximazuredanawigasifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7145c68-845f-4513-baab-fd0bd747af74/nosivifesanezepizokew.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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 5248 bytes
SHA-256: 724a635826781bbc944f57b9c1b00468b06ce2151b3f609ebd7de7ddb4d19d3b
font_01_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 10708 bytes
SHA-256: 05b561a522c502c30816a882a1c51fc7bf9bf743234533959b6254ef4f860ea5