Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f905a3df7e09b66…

MALICIOUS

PDF

78.2 KB Created: 2021-06-01 10:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0b94f7be0d6d58fdae57c75e3295b9c9 SHA-1: fbf3febd864c296e688bfe24289845716ce34e5a SHA-256: 5f905a3df7e09b661ccc0e58451a482c4db28b2d173ac5b45388a5107a263108
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and appear to be part of an SEO link farm. The document body, though partially corrupted, suggests a lure related to children's biblical classes. The presence of numerous external links, combined with ML and ClamAV detections, indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/pbw?utm_term=clases+biblicas+para+ni%25C3%25B1os+cristianos+de+3+a+6+a%25C3%25B1os PDF link annotation
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/vakilose.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/vunimo-fawesoganum.pdfIn PDF document text
    • https://buzomuzugagi.weebly.com/uploads/1/3/4/3/134313884/6579084.pdfIn PDF document text
    • https://tobotegitemusir.weebly.com/uploads/1/3/4/6/134651307/6808116.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/2130200.pdfIn PDF document text
    • https://lelewamopubexab.weebly.com/uploads/1/3/4/3/134324934/dakenebogiwule_garel_kuxalofagu_fukitam.pdfIn PDF document text
    • https://zadumujiz.weebly.com/uploads/1/3/4/6/134626950/2937328.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/6540e4.pdfIn PDF document text
    • https://xifefivelowisi.weebly.com/uploads/1/3/4/7/134724811/xolovirani.pdfIn PDF document text
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/3179720.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/3194662.pdfIn PDF document text
    • https://jizuxiragoleti.weebly.com/uploads/1/3/4/6/134639642/jugasorononabu.pdfIn PDF document text
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/gavadonunaru_kakaluk_womewig_bipelatojetax.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/f85a3.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/ef820181.pdfIn PDF document text
    • https://wubomedigupuda.weebly.com/uploads/1/3/4/6/134696881/lusadimoniviruwoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c9d960fe-f2f4-4daf-bf49-34e6a2fa1801/how_to_install_viper_smart_start_in_your_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157feddd-724f-47db-8907-f0f9762b1a31/slack_profile_picture_gif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ce28e7-db00-442e-894c-5dcd68c7ce07/wapasijepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f1dd96-ab9d-44ce-8bec-12c6d3c71188/jbl_flip_5_bluetooth_speaker_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d23f24c-d2a2-4e8b-858c-7b2bc00ce3bb/41309994707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ceedf5-1e24-4159-9358-84cce9ef05d8/how_to_deal_with_anxious_stress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86be72c8-6862-44f5-833f-312d58faed8d/exceptions_to_mendelian_genetics_worksheet_answer_key.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_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 5548 bytes
SHA-256: 9365b5ac9f481a56d4948861e9e1e3191fda97febeb9a4b2fd23b5badd6b2c6c
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 11580 bytes
SHA-256: d3e601a62538d5e54dd2bf4df209982f96439405e50a0da34378504e8bf1e8c7
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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