Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c1226694ab1a8f…

MALICIOUS

PDF

78.1 KB Created: 2021-04-02 17:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 66ea93a415bded7b522330d7aef837a0 SHA-1: 5440e6237beb3b2347c47633e589bbf4e490c87d SHA-256: 79c1226694ab1a8ffd381665c006113ea0cd5307f41f03d9a79e83a87f318b30
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 0.9998

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://resalured.ru/strik?utm_term=how+to+be+a+pimp+in+gta+san+andreas PDF link annotation
    • http://laura-egorova.ru/towopuzmvivu.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/5gfjajb/gideloxawojemudi.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/hdqoOmR/sizibavumonelulabiwije.pdfIn PDF document text
    • http://arthromedshop.xyz/how_much_do_criminal_defense_lawyers_make_in_new_yorkd9l40.pdfIn PDF document text
    • http://brettlockhart.com/hojas_de_ruta_jorge_bucay8nyze.pdfIn PDF document text
    • http://akmurzina.com/the_theory_of_interest_irving_fishernjko0.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/QYgh4Sn/tip_top_tux_sioux_falls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d34c7e-7e1a-48d2-9ab6-86daf7664025/sword_art_online_alicization_war_of_underworld_season_2_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/kenmore_350_series_water_softener_grain_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/13306061533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cef795-ed6d-4238-a7fb-7cd24afb456f/38183076275.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/93253202772.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_23b716fc6dc74acfb2df139a9969a64b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8598f51-1183-4401-a836-73f1995486ce/37242915896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4f645f-4c4b-4ab9-bb5d-5fb09ecdd1cb/baxi_luna_310_fi_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/arnold_schwarzenegger_meme_template.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_fd1c07958c894e359bff7aac93590291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/accc886b-25f6-427e-9e02-73cd86eb0fd1/how_to_reset_the_time_on_a_sony_dream_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc20685-803e-40f2-8c85-29af4f613b92/senuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2286c230-f441-41cc-9cf9-23386d39f98b/digitech_gsm_auto_dial_alarm_system_user_manual.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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5440 bytes
SHA-256: caa7edb8bd90bdbb7d6c79babe46147ebbd4fa649fcd182c946179ff7e8dfd1a
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 11008 bytes
SHA-256: 77db579c6d5de7b087dc11b346f95a3d8fa815cb6cdaafe4d4ff90d2ec05a739