Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5f08d57d5d709a…

MALICIOUS

PDF

68.5 KB Created: 2020-11-08 00:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b38cd7caf7876cb13cbb1788cd3d659 SHA-1: 9f6bf23e6a747e547c28d182ba894d6d68e816f4 SHA-256: ef5f08d57d5d709aa6fc0f706ce6033eac4f9259fdcb55b43633e3c9d2e8de57
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on disposable or suspicious domains. One URL, 'https://traffine.ru/123?keyword=galatians+3+commentary+enduring', is flagged as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content distribution network for malicious purposes. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?keyword=galatians+3+commentary+enduring In PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/5424734.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/xumosetugi.pdfIn PDF document text
    • https://xiwajobuxeke.weebly.com/uploads/1/3/4/6/134637113/poreto-bobelogitiku-dopijimakoja.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/7841293.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/12af0277-1be3-41ab-ac5d-fd256a9d34d6/westwood_t1200_for_sale.pdfIn PDF document text
    • https://wukifopagoso.files.wordpress.com/2020/11/74797368099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c844c3af-55c5-470f-b66e-f626fdc146a1/paises_e_nacionalidades_em_ingles_exercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/milebus.pdfIn PDF document text
    • https://pifujimuseki.files.wordpress.com/2020/11/tedujodovobizikeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716cb731-7da1-4ae0-93e3-43eeae2973c8/36480534216.pdfIn PDF document text
    • https://diwelozizof.files.wordpress.com/2020/11/52445349229.pdfIn PDF document text
    • https://bobikebuf.files.wordpress.com/2020/11/95135030775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed811be-b1aa-432a-9726-d5ffc75d8ca5/vatavuwodigogoxo.pdfIn PDF document text
    • https://dogowowogab.files.wordpress.com/2020/11/como_argumentar_e_vencer_sempre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582b0bf0-9a21-420d-a787-aeef249d8079/burlington_edison_school_district_salary_schedule.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_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 5556 bytes
SHA-256: 2566d74d8771a65f3abd3872e423ee0605a896d5fd65821d002086fa79a29439
font_01_sfnt_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 10448 bytes
SHA-256: 6619dcc024faa64d93be71a406d393bb5deb029c8e6dd9c450f4cfcfb486fb19

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