Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f85b103033d666…

MALICIOUS

PDF

77.2 KB Created: 2021-05-15 08:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b80c590a372159f4daeeb679678ff101 SHA-1: 8be531ab18bf8fbaf7fc14c8a1e648061528830e SHA-256: b2f85b103033d6664df71702d4cf007ac88f4639e1318a1bd209e0658aaf396b
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 0.9997

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://maypoin.ru/strik?utm_term=platero+y+yo+resumen+para+ni%25C3%25B1os+de+primaria PDF link annotation
    • http://fibaxoxadomi.sportsontheweb.net/mowubenepozijutunekevo.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/akrhe2S/46967782259.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fhigejh/add_white_border_to_photo_lightroom_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/ijii1jb/letisovukomokibekisavunel.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/simple_past_exercises_macmillan.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/HLWaggM/best_turbo_kit_for_350z_hr.pdfIn PDF document text
    • https://cdn.sqhk.co/pewonogip/ijjMicF/56476738286.pdfIn PDF document text
    • http://dufitezixapid.iblogger.org/how_to_study_for_sat_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/9agghaI/billie_eilish_songs_playlist_with_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dozopedatofol.atwebpages.com/administrative_law_meaning.pdfIn PDF document text
    • http://resiwilan.rf.gd/tony_robbins_awaken_the_giant_within_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/why_is_the_keurig_duo_so_cheap_at_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/counseling_psychology_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/wpf_treeview_hierarchicaldatatemplate_isexpanded_binding.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/background_hd_black_images.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_20ac9e721746454194b250703b6506ca.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_8685222f534142bb85097636070a0069.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_5d374f0a38e54a9c8c3a712371ee65f5.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_2f721c2faa3045209bf812e4fdaacedd.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/livre_apprendre_le_franais_gratuit.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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5420 bytes
SHA-256: 79787dca3244977c07568d449e1993b7b7f06a4f4f9758732440f578c0cfb57c
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 12452 bytes
SHA-256: 2e106bd61d21548cb9c84d75e96a00d09e315144b148072d61ef2313db9b950a