Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5a62acf2450620…

MALICIOUS

PDF

89.2 KB Created: 2021-04-03 16:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0197ba6cb4e7aec231fd44d986856e9d SHA-1: 7d15d028f9fd6d7c58f3a914a49fb05a5da66dfc SHA-256: 1f5a62acf2450620508011fa7cacafde21e88cf56908fa51cc353abc13c4d233
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or content-luring scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=kolkata+road+map+pdf+download PDF link annotation
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/17391e45.pdfIn PDF document text
    • http://kayikciakademi.com/sujupagukojakgrsn0.pdfIn PDF document text
    • http://fimewovoko.getenjoyment.net/21465947473.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/vijizevoni-lirivewipojidis.pdfIn PDF document text
    • http://salonapp.xyz/find_the_missing_exterior_angle_of_a_polygon_worksheetexbvw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_6040df5ae9800.pdfIn PDF document text
    • http://noverst.xyz/whats_my_eircode_address3id9a.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/96705764694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_601b43d25588d.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/all_clad_slow_cooker_rice_instructions.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/jinogutalibon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6027045ba320a.pdfIn PDF document text
    • http://olymptrade.buzz/css3_tutorial_for_beginnersb01mk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_603ececd95012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_601a2a7cd122e.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/9a03e834-6815-4cf0-9b07-3ff34ada72f7/how_to_print_network_configuration_page_on_zebra_gk420d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46409e7d-15a4-4f30-a2f0-e0f7fd3504db/bejosejatexibepefapujiduf.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/how_to_read_ez_go_golf_cart_serial_number.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/plastic_degrading_enzymes.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/wamez.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/mobogenie_for_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/51088377044.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_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 5132 bytes
SHA-256: ecc30bddee769ac5cd5605a724559a69748405877477ed643203cf3232bda94e
font_01_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 11688 bytes
SHA-256: c672f25a77550a7d813f0cdacb3e7e260df9e701c7611a4e4bc3dce745d679ae

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