Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b697cbb778f037…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 01:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8249ee3d3040e3b09aa65472a4747cb9 SHA-1: 1ce238596fd9939f76bcad9b1023f9314db2d717 SHA-256: 22b697cbb778f037222e1674e613f9977d7025f65760ac2dd76cd0298dab8415
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URL 'https://coretry.ru/uplcv?utm_term=see+you+at+the+top+pdf' further supports this, likely serving as a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://coretry.ru/uplcv?utm_term=see+you+at+the+top+pdf PDF link annotation
    • http://erulingua.hu/uploads/content_files/files/ninetibekudawefexuwipubol.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/magedikixuzug.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/sumivenagerikaxisuxata.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/widow.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/mevimosapulo.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/16252658993.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/wurodibarixidetubukiput.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/koxadaberaxamiteru.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_2e20e.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/48255653534.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/bazumibiduzanapib.pdfIn PDF document text
    • http://domplus.su/userfiles/files/rutikofunebidole.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/galupizolobivevaje.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/paramogaguk.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/43830572314.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/dotikabafi.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/rezupofifetumabuteb.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/redivumixeraxuwemop.pdfIn PDF document text
    • https://epiphanych.com/images/file/gulevilibagawuten.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/bixosejaja.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/kogelikivodelifum.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/72323124700.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 10372 bytes
SHA-256: a8809fed8518e5808d98f0f0c652d245c637d7241c899ad54bb8c56bcf720a86
font_02_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 19860 bytes
SHA-256: cf5ffe562c49834fc4c64a1bb9f29f32cdf0bcb167f75449f36d9ef81fee0859

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