Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ea6cff93d0db9e…

MALICIOUS

PDF

72.8 KB Created: 2021-04-06 19:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a2fe3dee8e75d25ae9d04f4e4df554b SHA-1: 5236eedee22a86ec5c9855e27379f2dd8be458f4 SHA-256: b8ea6cff93d0db9e6e123ab4134df317b21e202ac9c443e00b87aa69ccff8855
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://leonvi.ru/award?keyword=go+math+4th+grade+chapter+1+review+test+pdf PDF link annotation
    • http://kefuxew.22web.org/nofaxemibufabusizepatuzaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_60211095b00fc.pdfIn PDF document text
    • https://cdn.sqhk.co/giwibilawa/jhhhTgd/baby_songs_free_sinhala.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ddmQgd1/clash_royale_jungle.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/OLhgidL/jilufizajizoxorixatujagig.pdfIn PDF document text
    • http://zarujosusaxom.22web.org/50338138796.pdfIn PDF document text
    • http://merutakozuxonu.22web.org/ap_reorganisation_act_2020_notes_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/TgfO8GQ/zaguwofadoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_6045c2ff22696.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/ikgffhb/aadukalam_tamil_film_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagokirabi.rf.gd/informant_addon_1._12._1.pdfIn PDF document text
    • http://vifijugi.epizy.com/3_on_3_basketball_rules.pdfIn PDF document text
    • http://jaxifepuxebadin.epizy.com/astrophil_and_stella_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/bcd_to_gray_code_conversion.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/terraform_subnet_cidr.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/13179171543.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/gubipavewenajemisom.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/drama_korea_cheer_up_2015.pdfIn PDF document text
    • http://vugixemavofagen.epizy.com/gumorotatumumek.pdfIn PDF document text
    • http://fovatuda.rf.gd/64213350301.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_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 5860 bytes
SHA-256: 21e4501090cb51c25f916d776796ba3f63d0e338550c0cc3bcaabdfb98ef2944
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 11464 bytes
SHA-256: 0410c0404d73b05c27aa9827e209d70af3fd32ad4fef98b30527b0986574f6f9