Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6ac8fa758fed99…

MALICIOUS

PDF

82.0 KB Created: 2021-03-27 23:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c15189dee3f04db25c1d0fec7a8b08c SHA-1: 10921d672794ef1cc3cda6d772e78a3f93dce9a4 SHA-256: 4a6ac8fa758fed993da42df584734b3924b3d483c25a3771c9aeb813b5f57fae
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://lozipotod.ru/123?utm_term=seventeen+change+up++ilkpop PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5fcae7bc43a72.pdfIn PDF document text
    • https://dutukoviwu.weebly.com/uploads/1/3/0/8/130873875/vidisipasurijutus.pdfIn PDF document text
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/ee9e3c563e60092.pdfIn PDF document text
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/fogikojisakovuwol.pdfIn PDF document text
    • http://maddot.space/can_you_name_your_baby_godtg638.pdfIn PDF document text
    • https://zifuxiwow.weebly.com/uploads/1/3/3/9/133997311/gebej-tizofesu-silefemari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff9b38c8f5ad.pdfIn PDF document text
    • http://pribor-poverka.site/my_boy_gba_emulator_android_103mv6.pdfIn PDF document text
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/5196116.pdfIn PDF document text
    • http://clobuss.ru/15291806744063wp.pdfIn PDF document text
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/buperadevaxuzegeseki.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/9451131.pdfIn PDF document text
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/dukomaloxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5ff11977cf0e1.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/1857224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_600bb9723f9ac.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/jebapegumuf_deraperoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webekilijonelew.epizy.com/64807448296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ce196a-d83e-4b20-9d99-1848d5491772/new_2019_ford_mustang_gt_for_sale_near_me.pdfIn PDF document text
    • http://bamoxopigodarok.epizy.com/dupuxomozugog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718b3e49-2936-4c34-96bb-450f6d6ff000/xapefoninupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221a8cad-fedc-4453-b69c-20a7c95f1cbd/critical_state_soil_mechanics_examples.pdfIn PDF document text
    • http://lobakixadob.epizy.com/canon_eos_4000d_specs.pdfIn PDF document text
    • http://tereralubo.epizy.com/bbose_marksheet_photo.pdfIn PDF document text
    • http://pawutewitozi.epizy.com/for_elise_guitar_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17229538-4748-4460-bb92-1d262732cab0/lenamurotebewidufolix.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 3540 bytes
SHA-256: 54ac71e03e9772259749a6990642508b222cfb0c28ff23e334057a1a39ac7833
font_01_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 5148 bytes
SHA-256: 63e893b97803d9a715d2b52c4b8065fdf6cd64a4edef7f8dd6c2a75b8e9c2f5a
font_02_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 13496 bytes
SHA-256: 07c3587bc106fe9142f26901bda956827a8be7f20121118d8cc5aba9148f1e24
font_03_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 16368 bytes
SHA-256: 552e926f59ef53231249b6015cc51882b512f7a40c6b17c25f707dc25a221893