Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba43503b12c46e3…

MALICIOUS

PDF

88.6 KB Created: 2021-04-29 16:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 93ba8d01a19569c600da11640ad06652 SHA-1: 25bdfe6114011f41b3096b1f2fcb43217fbdab84 SHA-256: 5ba43503b12c46e3d99580767c2d96c86e46c707d41e70dd04039866d6cae8ab
186 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm or phishing lure, indicated by the presence of numerous external links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/strik?utm_term=what+is+nonviolent+communication+pdf PDF link annotation
    • https://widijusadapabi.weebly.com/uploads/1/3/0/9/130969823/nenebavor_dedamevenikib_bexugiwe_jawewulikux.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/9229285.pdfIn PDF document text
    • https://cdn.sqhk.co/dapalufited/KeFjiNr/zezizug.pdfIn PDF document text
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/f7b8d.pdfIn PDF document text
    • https://vadiwolor.weebly.com/uploads/1/3/4/7/134737839/45c60caa290ff17.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/gmrifgf/tiger_shroff_new_song_mp3_download_pagalworld.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/2394611.pdfIn PDF document text
    • http://roralukomoko.22web.org/oxford_picture_dictionary_english_free_download.pdfIn PDF document text
    • https://witatubaf.weebly.com/uploads/1/3/1/6/131606367/rifuxona.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/fotavonirata_zurimodoxe_wepesemopomitob_pafulazaganijod.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/ibCifgh/smash_balloon_instagram_feed_plugin.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/vagasozuvudoferirowe.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/historical_criticism_in_literature.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/wUhhH2n/80415619079.pdfIn PDF document text
    • http://sawelob.22web.org/articulos_de_autoestima_en_adolescentes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vasikiga.epizy.com/utorrent_android_incoming_port_0.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/affairs_cloud_september_2020.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_75d354e51f3f4103a50ee4c222c03ea5.pdf?index=trueIn PDF document text
    • http://rixibedi.onlinewebshop.net/tetisemuvonixan.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_4a27345f7f60464eb202522310a5fd3c.pdf?index=trueIn PDF document text
    • http://rixedimuven.epizy.com/tamil_film_assistant_director_resume.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_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 5372 bytes
SHA-256: 8bf7d1bd68e16dad3a27c0a8af9344d79f2a088a62afd463391c450ebf6ee886
font_01_sfnt_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 11228 bytes
SHA-256: 31ded012e6e9d07c3f82fe63c6893491f0fcdc35b7d97cc9d2b880f21cc4b623