Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fb2111ba1f916d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-14 09:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e8950406c101a8cdeeaac2f356023b2 SHA-1: c4fff2cb8db7cfa6eee28ef751729a21311f1ad2 SHA-256: f4fb2111ba1f916d65a5d4ea1480f30902ccb749bc71c621103c05a1e2cc93f7
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 one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=arturia+beatstep+pro+manual+pdf PDF link annotation
    • http://nigoviwan.22web.org/azure_information_protection_prerequisites.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/card_college_light.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/lafojavepixafelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_5fda99b4f1aed.pdfIn PDF document text
    • http://vawokupe.iblogger.org/sex_offender_registry_ohio_summit_county.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_602890fa39329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_60176f61dd357.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/cloistered_cleric_pathfinder_2e.pdfIn PDF document text
    • http://nuxuxavolas.22web.org/67849096615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f4f044154.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/10147092609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601952aedef59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_6033144324fbf.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/6d301c7f-2e03-43b5-aca7-5b3e6c242130/tugukunolexofuxejirerexal.pdfIn PDF document text
    • http://vupifokixen.rf.gd/market_leader_business_english_accounting_and_finance.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_5dcbe1b706564c449f790d71d4857864.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a8a15e-9e20-4d22-91df-e2ef11207266/what_camera_settings_for_night_photography.pdfIn PDF document text
    • http://gepemare.rf.gd/california_pizza_kitchen_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cfbad6-a436-4382-a62a-1de79ef15f81/my_passport_ultra_1tb_price.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_f2aa4c3408d941a1bdbf31e68f02df3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a19a7e-4870-4acd-ae6a-cb47accd4d29/21954096099.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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 5316 bytes
SHA-256: efc07756e131b3028f9c37b83ceffd7902cfa1368599f47346f34ad313016a9b
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10956 bytes
SHA-256: de1b2dac5805bba2668f85c45267d23f78348b00f3a709b5fcde8afed4f212be

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