Malicious PDF — malware analysis report

Static analysis result for SHA-256 237ab467d797f763…

MALICIOUS

PDF

83.3 KB Created: 2021-05-12 09:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95f4b6d56d2ee4d0d966145d730329a SHA-1: b82c79cdecbe2e063bd7114486f06863fd23617e SHA-256: 237ab467d797f7635c2f7002af30a28cf21348e638e77cd421723b1a3ba00768
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The primary external URL, https://pelibifir.ru/strik?utm_term=how+to+change+settings+on+google+maps+iphone, is likely the intended destination for victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+change+settings+on+google+maps+iphone
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/b214753332.pdf
    • http://tekplafond.xyz/proving_lines_parallel_worksheet_answer_key1lx3u.pdf
    • http://sipataj.sportsontheweb.net/cateye_micro_wireless_cc-mc100w_battery_replacement.pdf
    • https://tinuxitimo.weebly.com/uploads/1/3/4/7/134748051/258935.pdf
    • http://vseti.life/86928790320x3o9c.pdf
    • http://burivuvuju.medianewsonline.com/is_proform_better_than_nordictrack.pdf
    • https://futinenapol.weebly.com/uploads/1/3/1/4/131438538/7310499.pdf
    • http://gefosezidubajoz.scienceontheweb.net/xuziwutefodolofaze.pdf
    • http://verifybadgehelp.com/69605734235uo5ar.pdf
    • http://opticsystem.website/urdu_to_arabic_learning_books_free_downloadpc1ap.pdf
    • http://organicsss.space/tutorial_menggambar_anime_di_ibis_paint_xxvqx2.pdf
    • https://voxalasodakuro.weebly.com/uploads/1/3/4/0/134042561/6c3ed61e7.pdf
    • http://ziximotizaned.medianewsonline.com/bowflex_pr1000_home_gym_for_sale_used.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_e76d9888489a48789a39be4f0eb79104.pdf?index=true
    • http://marurutefa.atwebpages.com/66795805274.pdf
    • https://uploads.strikinglycdn.com/files/14856873-b990-4f4f-a6eb-bf5edff1510e/67714778651.pdf
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_39121252cafe4d578ca0cff7798e18be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99908c16-7431-4d13-a812-51a55f5e9915/48100809461.pdf
    • https://uploads.strikinglycdn.com/files/7796877e-f40a-4cb0-b634-38d38f5c825c/dewalt_mitre_saw_stand_parts.pdf
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_53bc9b0a573644be88388d8c4698d853.pdf?index=true
    • http://gakilasefit.myartsonline.com/8617955456.pdf
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_8d4eb20ed6744fd29eb6a0ad9fb820d8.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_c9a4fd8665af4154b6c07d6d3a83beb5.pdf?index=true
    • http://jujuletofu.onlinewebshop.net/walumidumune.pdf
    • https://uploads.strikinglycdn.com/files/9a8e4080-7cec-4328-91ec-1fb9a814de1c/22455807723.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f2.bin
834e28c83c407befee1f6a69cd3e7a77c34540596542a8993a8249ba43a2ff6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 5092 bytes
font_01_sfnt_off00010b22.bin
43f7ead42a57fb28de1e4116646427c20e3274941a492367e22d391c09050102
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 11144 bytes
font_02_sfnt_off000130e5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 4324 bytes