Malicious PDF — malware analysis report

Static analysis result for SHA-256 357a80d99e41cd4a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-13 17:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a1f6f6351a81c93d9e44c9ed71cd824b SHA-1: d7669964afc4a1a640b99819e790abad7481f4ef SHA-256: 357a80d99e41cd4a72e67150b3020980ef607d7491c21e63a6f5dd9121589e10
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse for phishing or malware distribution. The primary external URI points to 'baarspo.ru', which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://baarspo.ru/wix?keyword=rme+fireface+800+manual+espa%25C3%25B1ol PDF link annotation
    • http://sawemawe.mywebcommunity.org/motorola_xpr_4550_accessories.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/brand_identity_guidelines_template_free.pdfIn PDF document text
    • http://vofufime.mypressonline.com/which_one_of_the_following_systems_is_an_example_of_a_management_information_system.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/how_to_crochet_a_baby_sweater_for_beginners_step_by_step.pdfIn PDF document text
    • http://posebakuxosafod.getenjoyment.net/budgerigar_care.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5fec73680e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394071/normal_604addc95b52e.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/60080770498.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/an_introduction_to_cardiovascular_physiology_levick_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_7d9d24a971c5497fa8ce01157d63358b.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_36159372ba44448eb18c5f4dcac7b1c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a42eb5-63aa-443d-8d5c-283d6d419a62/nokote.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/81251295047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec22cdfc-73bd-4151-9830-890cae1ac7c4/big_fish_grill_riverfront_thanksgiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b372cc-d621-4443-bd0a-86d173c62a1d/que_es_el_sistema_de_fabricacion_flexible_fms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c8aca1-2975-4ecd-a84d-1b0040e5bda6/76057605193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbc2992-e227-43a6-abbc-a33a208580f0/roomba_655_service_manual.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_65ca2e81db38472496e1291b20e19f26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e819fba6-d84b-4934-80de-f71b5d8fa3d8/rogufekivowasefexixasob.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_03857a148e4d422cb9a6bf69e5bbdc65.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5716 bytes
SHA-256: 72d1c391eaeb7da95572db9e0f0295c5e011c46d872a3bf0bde131dccc7a2695
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 12088 bytes
SHA-256: 980f54c46c8983fdf619fafa72c391355f9ed17837538ce8cd5d4af14de3b03e

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