Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc8e0bebe3b9df…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 11:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dfd19ec012afc071d2197998c70bb602 SHA-1: a9a6013123737ecc49b26bc30c414a997f5ad4c0 SHA-256: 41cc8e0bebe3b9dfa52c2b1c50c132c64789cd6d0b4ac6e2f47256d1d1ee7b12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to distribute malicious content or phish for information. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://eko-briketes.lv/userfiles/files/zuxurofutadugufod.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/25391654117.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/94161518437.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/getakawo.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/nuvonodulakagevurekeva.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16135264c47441---woririsatogajaloxinerado.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/40411459840.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/seminizuzatedanexinobopet.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9c085394---89713308741.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/dasuninexekinunuxiki.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/xekukopebukixu.pdfIn PDF document text
    • http://lex.tj/img/file/bevulogolibu.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jibazopalabin.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210905140310.pdfIn PDF document text
    • http://lagrupacio.cat/file/pasatojelupegozazoxitaji.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/begega.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/52321605062.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/totuxesilesetomodewine.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/zidal.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/bumanolaliwisuzodereta.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/92206169869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=truecaller+premium+gold+apk+downloadPDF link annotation
    • 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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 15748 bytes
SHA-256: 75db647e4c69f3581e1c9c35a175c1431380fa2262d951599f680f43f159c5e9
font_02_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 10832 bytes
SHA-256: 3c3d7e08512bc22826119da9af2db069cf2688e349cf4026b4289c85625906ae

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