Malicious PDF — malware analysis report

Static analysis result for SHA-256 9805a98060ba956f…

MALICIOUS

PDF

74.0 KB Created: 2021-04-02 05:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 21588351a1dc53a25fbe3e0eda75d3b3 SHA-1: c18556f13561cc7a36e2c4e3f34108ee932015a3 SHA-256: 9805a98060ba956f43183b3f7ce77cdea40bb30cbaec8704152c6e40b0e25306
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious domains like 'resalured.ru' and 'italdom.fun'. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=remains+of+the+day+lunchbox+waiting+for+guffman PDF link annotation
    • http://italdom.fun/bagawubalewajifzxua1.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/39371069693.pdfIn PDF document text
    • http://vodoroding.info/jimobejikewirexodorokunxdf0p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_605a1f6cac595.pdfIn PDF document text
    • http://redpandarecycling.com/does_planet_fitness_allow_bodybuildersaieid.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/ccna_security_2._0_espaol.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/37585920940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6052d9bfd510b.pdfIn PDF document text
    • http://vk-settings-change.online/koladisikamaq712k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_603938829b020.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/3d738864-4d88-4828-95db-f8bcb3db72ee/samilesokekadizuxiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f753f555-4eb0-451b-87d9-26d53f61d0ba/memento_mori_origins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811a1715-91c7-4e6e-a7e6-7a7223cb39cc/vufapajef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433d35d9-9ba0-481f-879e-5c8dea2f7de4/how_much_does_it_cost_to_learn_how_to_weld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2acbe1f-b78c-49b5-9d56-9613fabf0b15/mipepowosuzutogoloxigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6846045-97ba-4532-aee2-771974e9c508/werewolf_dnd_5e_race.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a8aaf-28c8-4acb-b125-23174bde9af8/2491636579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716529d1-275d-4782-8085-6bcaa12b1554/vawajo.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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 5844 bytes
SHA-256: 63707491e2b9182149ef8defb5f5bf8bd42756dacdd9d39c70361c4a6af395d6
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 11296 bytes
SHA-256: ad15e77dd608b7d13469d7a5cab80575eef40942ead2d068e414faa84f1a8207

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