Malicious PDF — malware analysis report

Static analysis result for SHA-256 9863d0a7aaa2fcf8…

MALICIOUS

PDF

77.3 KB Created: 2021-06-11 23:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 57c6b9cfb88af4f683098afb317e12a5 SHA-1: 3d8b883348de3ca6d9f0ef3b5d75072f9b726fce SHA-256: 9863d0a7aaa2fcf82ab5ba75ae47bc60808c41419be39315f3996a0033e3213b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'medvor.ru/pbw' and a query parameter suggesting a lure related to relationship trust. Heuristics indicate this PDF is a link farm on disposable hosting, and a machine learning classifier and ClamAV both flagged it as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=importance+of+trust+in+a+relationship+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fe3329e2acc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffa6b6f42d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_60256339a743d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fd79cfc439d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fda85c61ed5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejugaga.pbworks.com/f/22016827639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0d078b-11f5-4cc1-b2c3-8dbeb92633e9/17795438347.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/videkinosonipaxugalapulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3fb1df-e369-44fb-83f5-413c943e4cec/zefixixowejomu.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/38844246.pdfIn PDF document text
    • http://pevozowo.pbworks.com/f/nogopobidutibodukufokul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c39d8c9-fc8d-4dfe-8650-2e216fea6c17/500_spanish_verbs_for_dummies_free_download.pdfIn PDF document text
    • http://gomedaj.pbworks.com/f/is_walmart_good_for_america_video_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e954c59-f56b-4b8f-a1f9-2c2cc6ed3121/what_are_some_popular_spanish_idioms.pdfIn PDF document text
    • http://sisiwovad.pbworks.com/w/file/fetch/144960492/rockabye_song_free_download_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944257c3-0afc-4fec-a9fa-33999400172a/how_to_use_single_serve_keurig_mini.pdfIn PDF document text
    • http://mevuteled.pbworks.com/w/file/fetch/144568716/26382712021.pdfIn PDF document text
    • http://pifidopexi.pbworks.com/f/xulotipipewoxoramogir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4257295-4cb8-49dc-a5d5-02473773bc50/the_heiress_movie_2019_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519afb62-3922-4a37-9a84-9c6aff6b34ee/11331244537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63b0607-dae8-4bf2-83a8-2d8d5120152e/how_to_tackle_someone_with_a_knife.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/145069887/madakolonoriludajogobojo.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_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 5332 bytes
SHA-256: 853e82127ccc7462a6d00ef3f2f0c41a8a8c1f5d1eb4b5acd7a7b65a2f0e1e88
font_01_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10512 bytes
SHA-256: 420daf2d332d41fdc561bef6456b5aa8b935bce4c714269ea5aec5edb4bdbe84

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