Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16cb8ffba4e3af0…

MALICIOUS

PDF

94.1 KB Created: 2021-03-19 23:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ea7c89af49d4f94def8ee358357031ca SHA-1: 965b9d249d512967e5e22dc6011bc2325f969866 SHA-256: b16cb8ffba4e3af0d731306ce37bd7333f465967316c10c5157f65a5be9d2982
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=when+did+the+age+of+imperialism+occur PDF link annotation
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/bf9466fb1a.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/jikavokiroxut.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/hG3x0q9/87511032473.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/5063317.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/the_color_of_magic_audiobook.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/1098693.pdfIn PDF document text
    • https://kikezisukoka.weebly.com/uploads/1/3/5/4/135400991/naverowezurogaw.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/gaxorogonajuw.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/ijbQgh3/sanunukopabi.pdfIn PDF document text
    • https://gulemexaw.weebly.com/uploads/1/3/4/3/134360266/maviba.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/46135303573.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/jjjbXk3/ballet_class_music_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/wixikinotu/iiRjfIs/28692326149.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/xatujeratolob-gavizotuvujok-ziketopunut.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/dimidume-sozunokevunig-mevuvijavozolu.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/air_force_football_roster_2016.pdfIn PDF document text
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/646b9e27586ff.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/sezebepit/vedemipoxofimizomeparuri.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/40113484263.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/calculator_photo_locker_apk.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/pirutanoratufinupop.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/audacity_download_mac_10.7.5.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/60767002056.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_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 5580 bytes
SHA-256: 7f330b962bf178f7ad76f91e88dd7c9ff3ddabaffc0abca68911619e0793c366
font_01_sfnt_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 10436 bytes
SHA-256: b102d1c03ae4614e81fbb4e4f5246ced23755df50189e93be99093d55cad2c97