Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e435837c3b6cfb7…

MALICIOUS

PDF

78.3 KB Created: 2021-06-10 07:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 03bfa08648d450f5b4f11bec90c6b669 SHA-1: 7a7f6f28ab3042a9dc6b3fab3ae25fffbfcae5b4 SHA-256: 2e435837c3b6cfb762144af74365c4ddff66318c854d4c1ff38f3c08a70c007c
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/pbw?utm_term=holy+by+justin+bieber+mp3 PDF link annotation
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/2818067.pdfIn PDF document text
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/sarevaso-guzunogovibodax.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/6653826e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5ffb7ec6db451.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/fezalidifomuno.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/c9e21d7.pdfIn PDF document text
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/fuxav.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/2771055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_60b7e7d9b1e99.pdfIn PDF document text
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/pajusud.pdfIn PDF document text
    • https://xivibivo.weebly.com/uploads/1/3/4/3/134353446/najot_kadolimelaripog_dosaxujugefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144620646/among_us_descargar_gratis_ultima_version_para_pc_2021.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/textbook_of_microbiology_for_dental_students_free_download.pdfIn PDF document text
    • http://guleribiko.pbworks.com/f/colonias_de_klebsiella_en_agar_macconkey.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/f/addicted_2014_full_movie_online_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619bde80-a3ba-45d7-9bcc-224e05c10b51/46093292555.pdfIn PDF document text
    • http://nelivameg.pbworks.com/f/walor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f6c898-883f-4d42-b121-363d2b2f55cb/modofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7fa46d-da86-456b-a92f-0a8c8fa6d157/71263214070.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/f/what_does_jello_mean_in_slang.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/phonics_activities_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90920648-6ee3-4447-973f-c46e0b282988/wupukodexo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 5196 bytes
SHA-256: 8068d1d01dfe459044aeaaa57da16b4b8986d58416847377820f5064bd414df7
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 2044 bytes
SHA-256: 00e9c67b84577ee292276cd5de885299f23f5730b2327ee67451e1a4c0ce668f
font_02_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 13600 bytes
SHA-256: f4b2a5bcbad5ca73482b3bbc720137f8be569b3dab17925f597858ef8242484c