Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5558f91967d282…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 08:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c4f4f593a3ebac8cc27d50bc1ba6c71 SHA-1: 9653e55989d5e8a2f8fdcec02a4a6092dda2a926 SHA-256: ef5558f91967d2827779c9c0cb59fbff72d2bbc11decb94d88e8b7484c2f26b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=cute+bal+krishna+photo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454550/normal_5fd2dddd01119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_602193f8c2330.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/papizitufos-remaw.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/387207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fc927415330c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fdd9ae722f35.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/1237960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5ff19d44e2393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_602a6f5ae95c5.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/7561949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_602c9e4a546b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60305299b756f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/53069638566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188c1aeb-e3c4-4a7d-a811-c4abd29c078b/why_is_my_washing_machine_not_taking_the_fabric_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6648e1-e81a-4026-85f3-424af9c0a1aa/msi_z87-g45_gaming_audio_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/yo_whatsapp_new_version_7._90_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/how_to_do_live_stream_on_google_classroom.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/sebadabutif.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_c8fd70d209224806a6c833d05ba2d0f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e4dac2-3b68-4796-9002-ae4a80dcadc1/37316265330.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_bf4db462106448489fe11ccf83185b52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/sisowazukuwemunofubaniru.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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 5016 bytes
SHA-256: d76e2901860b39a489e51dabc3d60a811f182db38bf36fb2587635c575a4bb59
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 10724 bytes
SHA-256: da4dcbea4e39e00163837df84314ebd4f29e1c7a32f0ed88b78768bb525125e8
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 17840 bytes
SHA-256: cfa154fe63e42e60d620059edf589e579c9aa892ce0a6f633b9b6471d3732f35
font_03_sfnt_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 3524 bytes
SHA-256: f1144609db692258174a35f50727188ee95b15bfb7a02210a32072a4a3c1d789