Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cfabe86395d889…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 10:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0b77bbe6d7c4e45e5fef05dcd13fa7a6 SHA-1: 1e74448add5c88daa9606cc1e9e38203d7b7b58e SHA-256: 23cfabe86395d889d1f124ef8390ca51869fabebe2df3439be924cfe7a5502fe
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF files hosted on disposable domains. This technique is commonly used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=infrared+security+alarm+project+report+pdf PDF link annotation
    • https://cdn.sqhk.co/sajatanugeg/hdrchaR/dunkin_donuts_stock_market.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/47RIxtC/13564072132.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/f79806f82.pdfIn PDF document text
    • http://mmamba.ru/93076012898uv7rf.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/U0R17jj/27079947883.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/five_nights_at_freddys_theme_song_roblox_id.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/rifexozawinotudadasi.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/Vgeb2eI/zizegobejabasijexokiruwe.pdfIn PDF document text
    • https://cdn.sqhk.co/wojidumezu/jWtiajc/77713072936.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/IzZDif2/66058564767.pdfIn PDF document text
    • https://mapikomuxet.weebly.com/uploads/1/3/4/5/134579134/8022081.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/diihf0C/flix_movies_today.pdfIn PDF document text
    • http://sewonmedix.ru/ruxafutupqyzhj.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/15604845976.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/2f7f6740dda.pdfIn PDF document text
    • https://cdn.sqhk.co/sumexasov/hejihbA/sokawunovitax.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/pusagiposojot.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/gzgh1gh/40452485276.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/heBjiOz/rescue_game_save_princess.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1114e6-8a6e-44a1-af18-95931b229bd0/how_to_write_a_scientific_conclusion_for_a_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c01aa5-7043-474b-aae9-8b5a13bd9886/how_to_clean_philips_avent_bottle_sterilizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e29996-45d1-4324-971a-eddec4b89b31/gasudomotev.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5416 bytes
SHA-256: 3984cade7297f3c1242d141b4d349d8278d6daef63e559da7c74627caefa74b8
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10756 bytes
SHA-256: 0536f229c4201023ab87bb4bcf4b7b4b9a13b48cdf638328e577eb1bc0b1bba5