Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bfafd29aaf539b…

MALICIOUS

PDF

90.9 KB Created: 2021-05-11 04:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b0e77f30e86672fbf0424d435d75c36 SHA-1: b26c2f17ded90c2f19bac0df480f1cfb434dbb54 SHA-256: 76bfafd29aaf539beb1dfee1c7f1e08f7e757422097daa5e8a6e9e5fe9dae220
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 0.9996

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/strik?utm_term=abu+garcia+spinning+reel+for+saltwater PDF link annotation
    • https://cdn.sqhk.co/dedogupazib/hvQUhfx/regal_cinemas_palladium_14_imax.pdfIn PDF document text
    • https://pibofarijefi.weebly.com/uploads/1/3/4/6/134648305/nokafiladekifixi.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/duxepado.pdfIn PDF document text
    • http://palopepidek.mypressonline.com/64843371423.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/spanish_grammar_beginner_intermediate_and_advanced_levels.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/37701127929.pdfIn PDF document text
    • https://gurekageta.weebly.com/uploads/1/3/2/6/132695257/fbc47c.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/gcZelij/3_slingmaster_tactical_personal_weapon_attachment_system.pdfIn PDF document text
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/b42a292.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/QDfcvhi/recent_apps_screen_android_pie.pdfIn PDF document text
    • https://goreduve.weebly.com/uploads/1/3/2/7/132740848/kawuxo-tifadilaxifat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_0f06e5df4877469592b337cc2be2ca08.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_70daa5cdba87469e93b115be2285e4ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7809b20e-9e0f-4e7d-b48d-daa7595d77f0/crochet_stitches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb518432-cf12-4fab-8e90-2eccce5e029c/28895441984.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/dollhouse_2020_movie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a056065c-7cfc-4924-8c15-a8f80ecfecc3/how_do_you_fix_a_ge_washer_that_wont_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d24de31-37a7-469a-b1e3-b322c0efba62/58760135846.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_df75332acda1412798a914069d712730.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_0d6e201887dc4797aa9e009020a10cfc.pdf?index=trueIn PDF document text
    • http://sinusisokopex.atwebpages.com/pathogenesis_of_diarrhea.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_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 5404 bytes
SHA-256: f29d7de9cdf006a970d14632e278c7cd53e4a7107d7e94cd4f3f35feea0bd427
font_01_sfnt_off00013663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13663 11104 bytes
SHA-256: b936f08b2ec1431c8f2c183ad8b062a203165e6857049ed0421f96b1ab1a0278