Malicious PDF — malware analysis report

Static analysis result for SHA-256 d019442bee0fb7cc…

MALICIOUS

PDF

68.9 KB Created: 2021-02-15 09:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3f01b8dc3d2dc1fd1590eb9cc9c45ce2 SHA-1: 013d4e4c1aeb18a8309428c41a9d7d2f188ec0ba SHA-256: d019442bee0fb7cc4d189cf91d7dd647017c082c2061d3ebd34a1d71d1c50f80
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs suggests an attempt to redirect users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://leonvi.ru/wix?keyword=jsl+eavesdropping+answers+13 PDF link annotation
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/598941.pdfIn PDF document text
    • http://douchehub.xyz/1564788005781nxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ff3a25d40e63.pdfIn PDF document text
    • http://goldstein.capital/661921592138vgbp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5fe9e044bf6d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_5fd79da1664b6.pdfIn PDF document text
    • http://milano-moda.space/471749858876bx88.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/LidgjeK/ludidavijuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwarirekagugen.epizy.com/anonytun_apk_for_iphone.pdfIn PDF document text
    • http://sijeviveb.epizy.com/bikini_body_guide_1._0_free.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/fopikujo.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/child_care_forms_odjfs.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/97159604064.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_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 5484 bytes
SHA-256: 8f87b30960bb65c52e2bdf7325e50b1debceee974dcdeba9f20a5145dd61f138
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 12528 bytes
SHA-256: e590ae81266fafd2144f972ca5c67e35aa21b4cba8fcc7bdff119ffd7c4eade5