Malicious PDF — malware analysis report

Static analysis result for SHA-256 beec4b02bb1b638c…

MALICIOUS

PDF

78.0 KB Created: 2021-06-09 16:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4bd60a8cb8e58642105c823d06804c79 SHA-1: 3e5e73abe31b25fcc3cc7d78aebf7259f6225a57 SHA-256: beec4b02bb1b638cb04e8ad5b46d217ddd6622bb698dcade09ee6adf394d8904
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 are hosted on disposable domains, indicating a link farm designed to manipulate search engine results. The primary malicious URL identified is https://bologen.ru/123?utm_term=miller+and+levine+biology+florida+textbook+pdf, which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

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 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://bologen.ru/123?utm_term=miller+and+levine+biology+florida+textbook+pdf PDF link annotation
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/zokubuzuxok.pdfIn PDF document text
    • https://mefiwoteta.weebly.com/uploads/1/3/5/9/135956645/439980.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/2558593.pdfIn PDF document text
    • https://xonugovelixef.weebly.com/uploads/1/3/0/7/130739086/143f97.pdfIn PDF document text
    • https://tekazomegi.weebly.com/uploads/1/3/4/0/134017279/740c5dc.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
    • http://verodudowop.pbworks.com/f/new_day_theme_song_mp3_download.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/long_multiplication_column_method_worksheets.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/w/file/fetch/144790470/microsoft_visual_c_2008_sp1_redistributable_package_x64_error_1935.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144464217/woxisoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff17ada-aca5-4788-85a3-427885a31409/60155517997.pdfIn PDF document text
    • http://pifiloxema.pbworks.com/w/file/fetch/144736896/define_problem_and_solution_text_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9abe1d-4a84-446e-b61f-9dad158d83ce/logon_servers_not_available_windows_10.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/julewekakewus.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144437949/growatt_20_kw_inverter_datasheet.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/scotland_yard_rules.pdfIn PDF document text
    • http://zobifel.pbworks.com/f/xasunono.pdfIn PDF document text
    • http://wamewariz.pbworks.com/w/file/fetch/144855579/how_to_clean_whirlpool_washing_machine.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_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 5260 bytes
SHA-256: 16c5907683cf49bca5ec57e9fc8cf959d4bd7772b8a518589877a84677e61a96
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 11832 bytes
SHA-256: 53555f32651d999e4b954325c6e060772996e59d3928c126d792c99db3f15711
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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