Malicious PDF — malware analysis report

Static analysis result for SHA-256 377a670e7a7b8b1a…

MALICIOUS

PDF

78.1 KB Created: 2021-05-03 18:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b72b08466ba5d16444e6071bae46342f SHA-1: e226a11bd1e6b44e0207c5631e8ad4c8e22e13f5 SHA-256: 377a670e7a7b8b1a76d2be8bdf8d5e091f59a4c21772566d90eeaea13798cf33
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 0.9991

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://golowaki.ru/strik?utm_term=how+to+recover+from+an+emotionally+unavailable+mother PDF link annotation
    • https://cdn.sqhk.co/bovutolomevo/ghrCZje/95350139216.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ediagj5/life_of_a_peasant_child_in_medieval_times.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/xufekugogoradodo.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/7c7894db55a9.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/turizamadirena.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/6f87f68b.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/vjeIkji/soccer_world_cup_qualifiers_results.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/hfmiawI/horror_live_wallpaper.pdfIn PDF document text
    • https://samazixudoreput.weebly.com/uploads/1/3/2/6/132681586/gunigivoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/ehcpBoY/blue-_bot_class_and_school_packs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/twenty_one_pilots_hometown_piano_sheets.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_63f7782ef64749148e51d7bef10e2b22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/buddhism_facts.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_9a465989f3534eddae99e0c5f4bf9354.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_1f50ffb6853148908b160bbd116e88b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/82880258573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3fe8b8-f92f-48de-a65c-95720a114c17/25746404630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887fef1b-c49c-43ca-a456-612d0abd851d/repepapapiduwomozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b53112-36d7-4405-b1ff-4c5f7ba273eb/89317848766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df094078-03ca-458d-81de-12c744272579/netherland_dwarf_rabbit_colours.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/98792435150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac93315-ebdc-4802-913c-8b06badacdaf/free_downloadable_quick_study_guides.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_0ecaefc06ad544a096fc432963411c99.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_30c8a25b57ef46c3abb0a0b65d3dfea3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf6dd2f-4534-419e-bad7-daf47c180207/historia_de_mexico_epoca_prehispanica_el_paisaje_veracruzano_era.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5296 bytes
SHA-256: 153df14e57ac8ca9fb235cca21b5ae012d0df2094cb25ca8179c084d3ab2c404
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10564 bytes
SHA-256: 482f79a09a56e148cb70f121cb3f12fb3602f6595f0cd696d2e383025103856a