Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81fef41ccfb11df…

MALICIOUS

PDF

74.2 KB Created: 2021-06-11 05:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0b4a74a6041a1c52a99a8ab8cea852c6 SHA-1: 0567e7705a41dd7d24c47941df7f94d26dc7136e SHA-256: b81fef41ccfb11dfe54f75e790255c4284227eec75309248291c8c3b5f3e0b5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The critical ClamAV detection and ML classifier flagging strongly indicate malicious intent. The presence of external URIs, including one with a 'utm_term' parameter suggesting tracking, and a heuristic for link farming on disposable hosting, points towards a phishing or scam campaign. The document body, though heavily corrupted, contains fragments related to 'Premier league live stream apk' and a download button lure, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://chcial.ru/pbw?utm_term=premier+league+live+stream+apk PDF link annotation
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/jebimunogurukaxer.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/silofakivaruni.pdfIn PDF document text
    • https://jesimepotagux.weebly.com/uploads/1/3/7/5/137508235/zodozipigoxis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_60427fb6ddd95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_605fe6a17e88f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144709404/53652472866.pdfIn PDF document text
    • http://buluwogot.pbworks.com/w/file/fetch/144599046/1162445270.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/f/badoo_premium_unlimited_credits_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a14ca7c-fb07-46e9-bd80-f0ca7e0fca8d/jessicas_theme_sheet_music.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/how_many_calories_are_in_a_burger_king_chicken_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17db1bbf-4642-4d13-94f1-4f0953276285/alfred_basic_piano_lesson_book_complete_level_1.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144587280/xinolonowexuxokixudeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993f06a9-c531-455b-a892-30eb4af3d2a4/kawisexafuzumelu.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/w/file/fetch/145012692/46495543815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d079c8-dd36-49b0-8fd2-7f286aa21ea7/what_is_a_shakespearean_sonnet_poem.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144522501/14036075294.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/how_to_spawn_a_tamed_dino_in_ark_ps4.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/nabard_agriculture_and_rural_development_syllabus.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144420378/how_to_describe_horse_sounds.pdfIn PDF document text
    • http://rozeluf.pbworks.com/w/file/fetch/144973935/class_12_chapter_3_chemistry_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8083ef7c-71d1-462d-99a3-9975584a9913/jupujaropomadeg.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144974919/jirevofimesi.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5264 bytes
SHA-256: fb20248474e9c1615520fce1d2a2eaa89edcb0d7c44a7023b5d79b58319bfadc
font_01_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 10976 bytes
SHA-256: f394e9fdc4f5e453b76ceaa7b72125ec58b61aa75b868a3b4befd6cd74eaabed