Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e745a846898030…

MALICIOUS

PDF

82.1 KB Created: 2021-04-11 01:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d81e1e7852a8983c8612025c2d8d7dc2 SHA-1: caf41d5b5be466363b007026ce6c8e0353164f5d SHA-256: e8e745a846898030aaa847a21b378365fc078e60e04b3379381e32a128bd298c
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=used+hpi+baja+5b+for+sale PDF link annotation
    • https://cdn.sqhk.co/rixutixim/bZ9MQEZ/amazon_seller_customer_email_address.pdfIn PDF document text
    • http://nifimoperokoj.medianewsonline.com/acrobat_standard_dc_convert_to_word.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/xcjh1ia/lirik_lagu_mimpi_k_clique_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/hjXFHG5/narezepaxewowoko.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/anRgeha/xevixeferukisaso.pdfIn PDF document text
    • http://jadaribod.mygamesonline.org/niwovaretutozut.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/bruhn_analysis_and_design_of_aircraft_structures.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/GKk9eha/caltrans_road_report_395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_4fd8faa0ce39433694e99ea5b4305da6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/greek_gods_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9c5813-4f6c-4a9e-9a29-cb0bb3b93438/wipezeziki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f40de8-549d-43e4-8b38-5bc78efe80b7/timur.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_8fdeb00fad134ee4b5158cc3a9009105.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_1850ebc74a0c4e86be9f18996875e23a.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_8a8069f16aae44718f903e0d67c85723.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/24870079792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9e5b20-4b17-4b0b-95f5-100ca701b53c/lenovo_thinkpad_t430_factory_restore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e45b5b-a419-4158-a159-59ee22cd4983/papiropofazofivikararap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fd6732-1bbd-4387-a30b-31e4761bef8f/what_is_the_economic_interdependence_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/xupumag.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_4ff1f17a8b7a49f9a8f95d58455b212a.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/58399505133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76b7ac5-372e-46b7-bbb6-796f6a816634/good_canon_camera_for_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/fractions_worksheets_gcse_maths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd94b53b-9c90-4257-a860-be36bcab8de2/sigmund_freud_psychoanalytic_theory_of_personality_development.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_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 5460 bytes
SHA-256: 4246a45e81d5b09bdf5ecf125818d6f952fcacd297b6e3296fdc2f9806d59377
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 11292 bytes
SHA-256: 4d3996ae9d64b4749fab82e0abbd18bab9815c0e88736542c99b094c8bc7572a