Malicious PDF — malware analysis report

Static analysis result for SHA-256 272240fc2aa2ff9c…

MALICIOUS

PDF

40.2 KB Created: 2020-11-06 15:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1eb8f54e79c3645c4c66e095be41c90f SHA-1: d9a907ea06b5378c38f6f3dbef195ab1c188022e SHA-256: 272240fc2aa2ff9ca138ad9de1b5be44ae05368f7aec28e6b3fc4faa5c042740
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a PDF link farm. One of the primary URLs, 'https://traffnew.ru/123?keyword=osmo+mobile+3+app', is suspicious and likely serves as a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to direct users to potentially harmful content or phishing sites.

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://traffnew.ru/123?keyword=osmo+mobile+3+app PDF link annotation
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/mesikimaxanejuv.pdfIn PDF document text
    • https://luwigemo.weebly.com/uploads/1/3/4/5/134597726/viroleg.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/nudavibabofepo.pdfIn PDF document text
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/2630479.pdfIn PDF document text
    • https://jexumaravoza.weebly.com/uploads/1/3/4/2/134265375/vefitonubu_witujanapexozi_gonena_nijake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/the_dark_elf_trilogy_exile.pdfIn PDF document text
    • https://jagulidul.files.wordpress.com/2020/11/xilekuduzisa.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/australia_map_template.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/83406844109.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/52691961431.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/enlaces_quimicos_para_secundaria.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_off00005d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 5200 bytes
SHA-256: 8c91933e13776ed57f087955296a517cf815d5ce393d920ec5a97e6f18b28517
font_01_sfnt_off00006eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFF 11016 bytes
SHA-256: ebe89c712711aac87b2bc6c592ca96eebf55a85c2c6829c64cccff606473ae15