Malicious PDF — malware analysis report

Static analysis result for SHA-256 828442f8489b545e…

MALICIOUS

PDF

71.1 KB Created: 2021-03-07 18:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f77876d6a8421c604cdb3bfcf1bd6db7 SHA-1: a09d369697eea40a646514f201c68910c57296b5 SHA-256: 828442f8489b545e883b1981b246993831ed500919e4ec45b7631338568a09fa
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary external URI points to a search result page, further supporting this. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

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://botokaw.ru/wix?keyword=fnaf+withered+bonnie+jumpscare PDF link annotation
    • https://farigelud.weebly.com/uploads/1/3/4/2/134266281/faxuxakewe.pdfIn PDF document text
    • http://insuranceautousa.com/how_do_i_verify_medicare_part_b_coverageo4617.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/ef2bc5ed715fa.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/zavutut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_602ebbb3d0d1e.pdfIn PDF document text
    • http://fortuneo-enligne.com/72934900418ymns0.pdfIn PDF document text
    • http://korsabarca.com/rolawimapakajuflogp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_6029c586a5cc1.pdfIn PDF document text
    • http://dashcamtopbest.com/26505781153fywy8.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/1105004.pdfIn PDF document text
    • https://tijoteveduno.weebly.com/uploads/1/3/4/8/134853829/tozigunoxisaf_tigejegutesevi_medugevovewo_kilasogev.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/58a87.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/5add57a9-05c0-4c41-88ad-67ec9bb0d1f7/xugeruxejelepagigebatuni.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_9340d9304ece4392bb0d8636e8df7b95.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e775b3405e4c4c97b6155792e8865ddb.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_9d318425db564283a3a86e7311943739.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5aaf7c-354b-4239-9bce-64f72ed9fbb7/3661207815.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_e68f99604271435bb2fb43cb8a51339b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5420b225-89e2-42c1-8ad4-d1c223569be2/muzijomevawurovolex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8d690e-a257-4a1c-95c2-dbebfd474df7/90053030768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c4f0cf-f1a2-41ad-bb9a-408647e46798/jewepiduzetariguwasofunan.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_56b702370caa4dbc9b77b19509165706.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5628 bytes
SHA-256: cf33359212d7783f55ef66563fba70eb727ae4e5ddfd159b22911b4c3038853d
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 10428 bytes
SHA-256: 4eea092f6a040ba1b4478ba3c7cc8b896e88828ef20746f7ea18dd8f85adf2a3