Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a7f21ad5ddb269…

MALICIOUS

PDF

76.1 KB Created: 2021-06-12 21:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e71df8d711167c3b8df1354dd59f8f75 SHA-1: 089773d11783e63435b5b4fb4b5de44ea4820a3f SHA-256: d2a7f21ad5ddb269591a90bb09154c123e533421eb604e96f5d57d6f1e7acdee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'catamma.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for redirection, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://catamma.ru/pbw?utm_term=gc+controller+adapter+for+pc+usb+driver PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389352/normal_5fee1cbfe55c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6038d2de7d53a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fcb4de2da5fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwofig.pbworks.com/f/sims_4_mc_command_center_mod_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12063b17-cc5d-43fb-9e64-73c24b3888d0/6192675303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4147bf9a-5851-4db0-a330-8e23856a7258/vakilazanevut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2e2d7b-588f-4471-b256-e01b07e030ab/cuntos_y_cules_son_los_libros_del_nuevo_testamento.pdfIn PDF document text
    • http://najajadux.pbworks.com/w/file/fetch/144669858/multiplication_chart_1_to_1000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b4909d-0b80-4958-ac91-f490dd011d6b/thug_kitchen_101_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f0905d-bdbe-4c0c-8f19-7ac697eecbcf/navy_drill_weekend_schedule_2020.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/w/file/fetch/144620712/sanabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c4451a-9479-4674-817d-f9144b9c1a9c/34375948665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5f9200-a77b-40cc-b8ca-f628e5b43f7f/john_deere_110_parts_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debf19f2-beb1-4e0e-bb43-56892345d360/an_introduction_to_r_for_spatial_analysis_and_mapping_chris_brunsdon.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/63881639910.pdfIn PDF document text
    • http://matekid.pbworks.com/f/zombie_outbreak_math_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4854e79-3e77-436f-9d05-d27b577a37ba/download_twilight_eclipse_sub_indo_360p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa5795c-1a5d-421a-b0c5-3e3b7c4abc73/psychology_class_11_textbook_download.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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 5380 bytes
SHA-256: b56b1d034bed8a4f108e4f9f89cb63ac99d41956c7abfdaaac1c5608b197b665
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 11072 bytes
SHA-256: 39769e6db66f53d33a78df08a92e9766e7abc29862ef96cad631ac1a481b99f6

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