Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baeb31a3ee994cb…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 06:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f629c5fbfde532d70f2c8800a0ed467a SHA-1: 68dc2605f9fb0043aa2ca31879b0f8765548dfca SHA-256: 3baeb31a3ee994cb560943bb9e279f0a103fab675fb43f017595e4a25ef698a4
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('resalured.ru') and others to potentially malicious sites. The PDF structure and embedded content suggest it's designed to redirect users to external, potentially harmful websites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=nccn+guidelines+breast+cancer+pdf+2020 PDF link annotation
    • http://revershjtb.site/dasitesixewusikomazezegazw2yft.pdfIn PDF document text
    • http://goldalbum.ru/14960094216qb074.pdfIn PDF document text
    • http://pochta-24.cc/33243030144so03t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_6010cac5a3189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_6057b77c1e6d0.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/edit_text_in_gimp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_5fda46cc01465.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/2571079105.pdfIn PDF document text
    • http://jilet1.club/kidogifalijavojizelbwuut.pdfIn PDF document text
    • http://chempion.coffee/a_writers_reference_9th_edition_google_booksthto8.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/teaching_aids_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_605ab0ce078f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_606024f89ceeb.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/arti_left_hand_path.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_47aa17b115474cfc89d70c8fed2dc18e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded33f70-e4c2-4e49-abbd-788f4760b8cf/17499663377.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_0f8ef480467b4cbc996bdde46a9635f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee5f40-6c4b-4dc9-892b-6c53b9019d99/how_to_clean_filter_on_lg_top_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176a2d76-0774-4514-ae34-f1c0c5f51838/tabujoberuleri.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_cdda80d793aa4c47a894136fb261f465.pdf?index=trueIn PDF document text
    • http://pitigapevede.onlinewebshop.net/self_driving_cars_pros_and_cons.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/how_to_be_a_certified_honda_mechanic.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/solubility_curve_practice_problems_answers.pdfIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_e11fb796a408474f98f100f3fc2f417f.pdf?index=trueIn PDF document text
    • https://medlineplus.gov/breastcancer.htmlIn 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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5708 bytes
SHA-256: f523154b1b26289fb3dda650d6655b652f424c51e7c525df29c166f941eb5fb9
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10760 bytes
SHA-256: 930077928eb3b1471a8fa9920b79d09dfa410d180574522fcc9a3c2531c5112e