Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4e74ccdf720e24…

MALICIOUS

PDF

42.5 KB Created: 2020-11-07 12:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0ae3690f5fdf9aec558c8591bda09895 SHA-1: bb8e00546a4a990e71c8d2479055e5f40ab33b41 SHA-256: db4e74ccdf720e24a0d3583c21988a17c2a094134f55403341690b4417d84fd2
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a PDF_SEO_LINK_FARM heuristic. The primary URL, https://trafftec.ru/wb?keyword=vivavideo%20apk%20pro, suggests a potential lure for software downloads or related content. While no scripts were explicitly extracted, the PDF structure and the high ML classifier score indicate malicious intent, likely to redirect users to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafftec.ru/wb?keyword=vivavideo%20apk%20pro PDF link annotation
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/837322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f99e9fe24223.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/c2099e721b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8a008ce3a9b.pdfIn PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/78f8d20279a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5f93a13ae1dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f870a0f5e573.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/2dfc8039-7789-478a-88b6-95ddb56255a1/simpson_maker_avatar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013f41ba-80cc-41cd-afcf-51bc2fb2581e/burilutuwolewaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364c010e-9e87-4876-8e6c-94c1696cf479/19168432952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e329c76e-8c54-4716-8d0d-12e158c43e0b/espada_de_cristal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7925cce4-a98d-486d-ac66-fa7094f0aede/que_es_la_utileria.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_off00006758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 4832 bytes
SHA-256: ee044b89e9a24c61458e76c9db921ec6e8e29db8501a2afad1b4f2d8619d8121
font_01_sfnt_off000077e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E3 11300 bytes
SHA-256: 0b2ebf93b2291e40bc853b342ac5bf267a056d407a9fc46cb3090905d05b32df

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