Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb861ba1e0772f5…

MALICIOUS

PDF

68.6 KB Created: 2021-02-25 10:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b4a180a2b7d371e89c8f5eb1eb64ef06 SHA-1: 0955a0e7867f4141cb1a89634de3100f73ca44ac SHA-256: bcb861ba1e0772f5c5e1992fe54a5d1d2241608dee08e4dc66e3b2de2281c68b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=cloud+9+smoke+and+vape+locations PDF link annotation
    • http://wigojomet.22web.org/xoxejenegewulagivuxavixo.pdfIn PDF document text
    • http://zopedefijewe.iblogger.org/39150529255.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/cetoacidosis_diabetica_urgencias.pdfIn PDF document text
    • http://mepotir.iblogger.org/fifen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_601f8d89d2f75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikazimizoban.epizy.com/is_cyberpunk_2077_better_on_ps5.pdfIn PDF document text
    • http://fipizojuj.rf.gd/naponudareresiw.pdfIn PDF document text
    • http://kubumoran.rf.gd/autobusov_ndra_praha_florenc_informace.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/motu_patlu_cartoon_2019_3gp.pdfIn PDF document text
    • http://tosopipates.epizy.com/brackets_editor_for_linux.pdfIn PDF document text
    • http://nikofutame.rf.gd/nitabege.pdfIn PDF document text
    • http://bemefidapuwemo.rf.gd/98738271462.pdfIn PDF document text
    • http://nasipitizu.epizy.com/childish_gambino_redbone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/buzovifunepamawazezigebu.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/girl_guides_of_canada_brownie_badges.pdfIn PDF document text
    • http://fepadegan.epizy.com/us_guided_brachial_plexus_block.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/rewibuzalovefarodinasu.pdfIn PDF document text
    • http://mopunetite.epizy.com/garuxagedefojeko.pdfIn PDF document text
    • http://sanebofav.epizy.com/les_anticoagulants_2017.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_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 5308 bytes
SHA-256: aeb8f90e53d1a5efd2aec9e8d4daaff5a898f8be805320ec6d86f6a46541077c
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 10480 bytes
SHA-256: 0151eb333ce5beb52a2da6042e5706ade918b634bd68701382450bedb6990456

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