Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bef74e70b6274c…

MALICIOUS

PDF

49.4 KB Created: 2020-11-08 12:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bbf15bf5d83a98ce1dd771d2b0623885 SHA-1: 4a463cb33132e9c30e379d1c0befcf7a900058ea SHA-256: d5bef74e70b6274c2c22a1f3777efe3483d81ce3f192f98dadd9a8355543de3c
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://traffnew.ru/123?keyword=unblocked+games+download+weebly', appears to be a malicious lure. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification. The document body, though heavily obfuscated, contains references to download-related keywords and the aforementioned URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=unblocked+games+download+weebly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452837/normal_5fa5455666d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f93645adb769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f9c9ec51ba21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f8c90ddd71e0.pdfIn PDF document text
    • https://jajivinejide.weebly.com/uploads/1/3/4/3/134354145/kimes-benuwos-nonokepija-lored.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fa7938181b88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://zugipokojer.files.wordpress.com/2020/11/76629685773.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/28515517504.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/factory_reset_samsung_plasma_tv_without_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/wafetopuneluwabef.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/lezimufev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f37bd9-68b6-46c5-8131-72827c7e19e0/selojulevofom.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/ieee_mems_2011.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 5212 bytes
SHA-256: b9ed790bb82341430d883eff2907a5a25092110cd4c4b0b30f1a51be4271dcb3
font_01_sfnt_off00008500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8500 11124 bytes
SHA-256: 17a46fa6c8836050b2b120ab22dee674acf32bce51e93293c954d776431c1c2a
font_02_sfnt_off0000aa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA94 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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