Malicious PDF — malware analysis report

Static analysis result for SHA-256 522cf2dfb85c0f72…

MALICIOUS

PDF

73.7 KB Created: 2021-05-31 23:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6937d43884bd8b5f8e7f69f9ac040b47 SHA-1: d68f9365e2a0cdb0adb6ed3a07e5c5d4ab5974eb SHA-256: 522cf2dfb85c0f72eb0cab0536de9b64c49b5c8d4ae73d4f74b626f265aa1a20
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though partially garbled, includes a title related to a traffic report, which serves as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/123?utm_term=chesapeake+bay+bridge+traffic+report PDF link annotation
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/2a583be94ef57b9.pdfIn PDF document text
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/vifefirivubifolotopa.pdfIn PDF document text
    • https://bimeriwuju.weebly.com/uploads/1/3/4/9/134901074/9548895.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/cfdb53f7be5.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/f9ea5e78-a659-4bcf-a11e-f9c170fb5bf2/50098909609.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144416496/verbs_worksheet_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6a8e0f-cb1c-4353-98c3-baeb0efaead6/71739342964.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413340/ejercicios_resueltos_de_gases_ideales_fisicoquimica.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/safabonekibiligan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74fefcf-8293-4af8-b5ab-c67a42c54704/nemeximupoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf4be88-7402-4031-925e-141802aa215f/how_to_design_a_board_game_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0453022b-0756-497f-95b8-2d5c8e1e3344/fanuc_18t_programming_manual.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/gevefawugijedivusasub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6426dbd7-464d-4778-8d5a-829e6eec40a4/demons_fyodor_dostoevsky_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66fa4c5-a37a-4482-ad45-7eeb8c9ece54/94277929139.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419613/63516133589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949ce85c-0fb7-4d1e-800e-f00eaf1ced0a/sazasopalibove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba92f2f-1484-41a8-9006-06388b56c849/bmw_e39_dsp_wiring_diagram.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5596 bytes
SHA-256: 9475743e72d632460566a19447f31dca2678eaa4c502604ef8785b3163077d0e
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10904 bytes
SHA-256: 007a1222311b41477a6a0480e09c88926e2be2c1d4aa42b601a9c76210285cee

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