Malicious PDF — malware analysis report

Static analysis result for SHA-256 19440cf666e0a580…

MALICIOUS

PDF

71.5 KB Created: 2021-02-22 08:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 62c7c878e4720af27d4e87ff0c9fe522 SHA-1: 70864fcae4e084169a8b388707e3981410d962a4 SHA-256: 19440cf666e0a5805725c1c5bb03765af5e3b23a2d339875f7c8c4f168658883
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. One of these links, https://maypoin.ru/strik?utm_term=logo+modernism+download, is directly embedded and suggests a potential lure for users to visit a website. While no scripts were explicitly extracted, the nature of the link farm and the embedded URL strongly suggest a malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=logo+modernism+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470389/normal_5fc8c62556168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_5fd17f1d2539e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc5e99defa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489428/normal_5ff63a416c1f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_601d0a0daedd8.pdfIn PDF document text
    • https://sigiduba.weebly.com/uploads/1/3/1/3/131384121/rakal_dosune_mavijovusuzage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5ff659e554ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_602b030fa49b6.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/vezotomaforegewelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5fde0191d5c04.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/15a96acd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_602db2454875c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_6023e366534e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_600b704aac898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5fd0e99a42191.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/fejakixoweka/organic_chemistry_naming_compounds_worksheet_with_answers.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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 5180 bytes
SHA-256: 8b3023d25dfdffc629f82d3918da0104d4931eb4d38aacbb4011616337609592
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 11988 bytes
SHA-256: 48037677f2308c5c81462b91ad250b08dc4d8ae930fa15d3523274090cb517ba

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