Malicious PDF — malware analysis report

Static analysis result for SHA-256 623281b88cffe842…

MALICIOUS

PDF

80.9 KB Created: 2021-06-07 08:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a248c5087e04d21edf170ff114fb730 SHA-1: 017a2b95a476213fd90590b1e8007fec66a7d36a SHA-256: 623281b88cffe842179fb1295f7f0f27bb4183c48815717c15953c355d34fb44
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest malicious intent. The ClamAV detection and ML classifier output further corroborate this assessment, indicating the file is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://cructi.ru/wb?keyword=what%20are%20the%20keurig%202.0%20models
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/tavodaker.pdf
    • https://cdn-cms.f-static.net/uploads/4475729/normal_6044a0d709a1a.pdf
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/6257944.pdf
    • https://petesironow.weebly.com/uploads/1/3/4/4/134495836/68204c9d196b977.pdf
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/35176b36bf7c5e.pdf
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/9015596.pdf
    • https://fixubosadad.weebly.com/uploads/1/3/4/6/134658154/8af0802c0.pdf
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6047d9dc71eaf.pdf
    • https://cdn-cms.f-static.net/uploads/4403119/normal_604d2babb6706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zepadatoju.pbworks.com/f/copper_wire_standard_wire_gauge_chart.pdf
    • http://mivegaz.pbworks.com/f/what_is_a_distinction_star_equivalent_to.pdf
    • http://sodopateduke.pbworks.com/w/file/fetch/144424791/ill_be_on_my_way_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/4986bc06-54b6-4fc8-8cfa-34475533eda2/how_to_get_bank_records_subpoena.pdf
    • https://uploads.strikinglycdn.com/files/281a8bfa-bd78-428b-ab00-590602a800a7/how_to_present_qualitative_data_in_a_research_paper.pdf
    • http://disisopaz.pbworks.com/f/why_did_the_radical_republican_reconstruction_plan_fail.pdf
    • http://zizovitunex.pbworks.com/w/file/fetch/144644001/fiitjee_aits_papers_free_download_2018.pdf
    • http://mujusevo.pbworks.com/w/file/fetch/144457020/manifesulilobirujefemi.pdf
    • https://uploads.strikinglycdn.com/files/5a1d726b-5939-47a5-9d40-83dc41b1d17f/home_depot_white_wood_bookshelf.pdf
    • http://vowujepojez.pbworks.com/f/3d_heart_flower_card_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd12.bin
2a4131599fbee7f78542a582f3c14f56568c9a496ab81a12d8546d854798581a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 5624 bytes
font_01_sfnt_off00011016.bin
fed05c3af088344223524f45ce5350befc5c3fd91a4e5488b6d6104eda66a781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 10756 bytes

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