Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb85d0e88941cb7…

MALICIOUS

PDF

73.5 KB Created: 2021-05-13 12:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bf4a170c418796a6b6bcb7e528b19c03 SHA-1: 2c70e3ee7b0703c26249b8fbf78f7b5d680fb28d SHA-256: dfb85d0e88941cb778d26557e44c71756ce802b4ca524653b4746f593ce2286b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to lure users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly suggest malicious intent. The primary IOC is the malicious redirector URL, which is likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=walmart+black+friday+2020+ad+nov+27th In PDF document text
    • http://nanonewe.scienceontheweb.net/sisuwinazam.pdfIn PDF document text
    • http://health2health.online/365478355577ckhg.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/jR9iccf/cut_rope_2_game_online.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/pamadim.pdfIn PDF document text
    • http://blognews.top/nozevujexumagaxexomaw3ic7.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/sgcETjj/super_mechs_hacked_version_download.pdfIn PDF document text
    • http://meetsoda.club/simple_solar_charge_controller_circuit_diagramaw653.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/c30d66df-63f7-4d79-a2bc-741502c85894/65447020693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0da939-ae74-46ee-9093-2aa1f1bba002/tuesdays_with_morrie_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b3e1a6-882e-4a1d-ba4b-c0fb68578a7d/52941730989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706cacb4-1e74-4ea9-84e9-a083c670d0aa/20112165538.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_31cd9764d9e942349a630aae8e5c6ae8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c940ea-0b13-4b8e-bc07-03951611288c/bagokabeb.pdfIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_ea42cb6221154c809dbb06e837ae5f0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be177e-c989-4f69-b7dc-24c0764b746d/pebble_smartwatch_301wh.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_b342d458acc54bc486f120c688c3fe8b.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 5816 bytes
SHA-256: 7523d82b1520b03655c19cfa07cc45920bfcaf274b25b045ad9c551872990e9c
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 11620 bytes
SHA-256: a89711ae4640d4dd78e2658b9c8518a7e172e7e6f21227ffdd2dfc263ddd433c

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