Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebfa02432c2a9db…

MALICIOUS

PDF

58.2 KB Created: 2020-11-09 07:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 32bd4313585355cfd12b7f0c443cfd4d SHA-1: 9560f2f13ff86e5fab75715030609e85a7791923 SHA-256: eebfa02432c2a9dbad7ba61168beb155409e8392cffdaea5d7e79f8b33783966
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms hosted on disposable domains. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings.

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://gettraff.ru/123?keyword=ap+calculus+ab+2014+free+response+answers In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/lodaxevizisufuvaza.pdfIn PDF document text
    • https://xalesuben.weebly.com/uploads/1/3/4/3/134368019/e2d704c3d6d5c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5f920b4f72952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_5f9a03aa372f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5f97ede4ada5b.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/ac7ee46ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_5fa455b81fd61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://tumitom.files.wordpress.com/2020/11/wazupalapiriwiji.pdfIn PDF document text
    • https://taworoso.files.wordpress.com/2020/11/10655582162.pdfIn PDF document text
    • https://nunerov.files.wordpress.com/2020/11/metes.pdfIn PDF document text
    • https://pavokido.files.wordpress.com/2020/11/38631544315.pdfIn PDF document text
    • https://mikijija.files.wordpress.com/2020/11/fisher_papa_bear_wood_stove_owners_manual.pdfIn PDF document text
    • https://kedijabu.files.wordpress.com/2020/11/jinojulukugogonole.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_off0000a015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA015 5644 bytes
SHA-256: 684de3e747411e80d1a75d2eac98ec5c2ad4c13329b1d7a1d2e59d213a3cf7b2
font_01_sfnt_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 11936 bytes
SHA-256: a3cacb64140ef4a46d5edc0e71c06599839dd8dcb4d4faefd7d3c262c3f8e468

Open this report in the interactive analyzer, or submit your own file for analysis.