Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff1d635c002189c…

MALICIOUS

PDF

65.6 KB Created: 2021-02-17 13:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 86bf9e1cd185a40200eb83454e2efad5 SHA-1: eb0ef21a6a5b636d5a9308b36e3e8c3e79a08e9c SHA-256: dff1d635c002189c43428506856c29939332d5111b37f7147d8985682a61b81e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being https://seumenha.ru/123?utm_term=my+oven+is+not+heating+up+enough. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to drive traffic to these external resources. No scripts were extracted, but the overall pattern is indicative of a phishing or traffic-generation scheme.

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://seumenha.ru/123?utm_term=my+oven+is+not+heating+up+enough PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405929/normal_5fdaf13a2ce69.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/halojhf/farming_simulator_14_android_mods_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5fd90e1a288f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5fe1022bc2348.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/roxenafuwuselopazu.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/8jhif0r/67621029070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_602a6c52bb615.pdfIn PDF document text
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/gekonewuka_polonizemimi_toxaxuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60134c916788a.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/pgiJhdc/pixlr_free_photo_editor_app_download.pdfIn PDF document text
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/tuboma.pdfIn PDF document text
    • https://cdn.sqhk.co/xazewizol/dNZijhi/supovu.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/belapawerezuju/self_guided_driving_tours_iceland.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/18997690970.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/miwetari.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/referencias_bibliograficas_abnt.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_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 5120 bytes
SHA-256: ed5d1d4406536c8f367cf179c4f23ca7add26c3189e186cc8d6c60fbf66c06a3
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 10392 bytes
SHA-256: 94dc637e046ef6e155e6ecca469c7d0f43b7be9ec3bc064db83581660e209e35

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