Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97541cdcda7a6d6…

MALICIOUS

PDF

108.6 KB Created: 2021-03-26 01:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8b44220947918c7b91c6534bcd0204b6 SHA-1: f983abee8199935b6c145e0dd2f7ba3b544b18de SHA-256: d97541cdcda7a6d60e23e63ecdc8485e2e4d865fa542abc996896f2280301a39
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or spam content, potentially related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=the+lazarus+project+aleksandar+hemon+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5fe7e448deb24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_6006c773da306.pdfIn PDF document text
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/7e5e4a0823c6be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_602607b0b6a21.pdfIn PDF document text
    • http://ubsvp.com/verusunazepubijagopalencznnw.pdfIn PDF document text
    • http://tranquils.space/android_emulator_online_for_testingfltdb.pdfIn PDF document text
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/0b91d159540c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_6007fe3db2538.pdfIn PDF document text
    • http://instapriz24.site/which_ending_is_best_for_ciri5l95y.pdfIn PDF document text
    • https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/7982546.pdfIn PDF document text
    • http://klyshsheff.xyz/air_fighter_jet_imageszl9w4.pdfIn PDF document text
    • http://pop-marketplace.ru/the_secret_of_life_book_quotesm82tx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_3e7bbd745c244990b22f08a4a94425ec.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_3b1ba15d4e6741268b9e8b6473c72642.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_b6eb66cfb4d1468a8dece926c4a76bfd.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_85e3bfa4539c4b8584fe0bff07f78c00.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_a69e1c78c57643078576f13e4c1bc7c5.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_cfaa60d812e94b05a7f3d6861183c711.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_9ea7b60c65cb488aa373a73ca67ba5b2.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_9a4bb353f76341b887e97e852ae9c7cd.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_9ef0be6c5e5a48159650db414ca6ddec.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D83 5368 bytes
SHA-256: b4b859810a2dae1b64975b96ca875d24a8e3407f0fd26ad493b19b61e409dce3
font_01_sfnt_off00016fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA3 12084 bytes
SHA-256: 22151b5e83376ca41dc7233fbe949e70ffdc3499a01d3f25545e05b7fca6a5ef
font_02_sfnt_off0001968e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1968E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2