Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b236953cb8c1194…

MALICIOUS

PDF

75.4 KB Created: 2021-06-08 02:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53686d554d793ee7218250f38f3a26f9 SHA-1: de0cabb3ec1223d233169d37540f4b7c602657f2 SHA-256: 1b236953cb8c1194e6c03fc7ab9cf51eb293b03984ba859a0cb3dfe24c1358ac
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link leading to 'smidgel.ru', suggesting a phishing or redirection attempt. The document body, though partially corrupted, appears to be a search query, indicating a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=what+would+cause+my+dryer+to+stop+mid+cycle
    • https://cdn-cms.f-static.net/uploads/4403823/normal_606730fe0f204.pdf
    • https://vidujari.weebly.com/uploads/1/3/4/8/134858315/nefexodakajuru.pdf
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/7235d5.pdf
    • https://mafinejolid.weebly.com/uploads/1/3/2/6/132683008/4241313.pdf
    • https://cdn-cms.f-static.net/uploads/4404497/normal_60bd036e99715.pdf
    • https://static.s123-cdn-static.com/uploads/4485689/normal_6001828a1fabd.pdf
    • https://cdn-cms.f-static.net/uploads/4481825/normal_6024a226c55ab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4dbcf9c7-a337-4304-a213-d66ccdfe6c2f/5377008043.pdf
    • https://uploads.strikinglycdn.com/files/21a338d4-502b-4128-8caf-ee3f0132202c/gebixesukewi.pdf
    • https://uploads.strikinglycdn.com/files/86796568-0f49-429e-941e-b5c85988d3d3/72974363379.pdf
    • http://vaporezikumu.pbworks.com/w/file/fetch/144725157/dakomojanavuvasugegavap.pdf
    • http://werinenimuta.pbworks.com/f/35974550263.pdf
    • https://uploads.strikinglycdn.com/files/29449cbb-b476-4a13-866f-921111fef9b1/viwisobebesifizazobuzeju.pdf
    • http://sinorodolu.pbworks.com/f/95762471319.pdf
    • http://febevolojezu.pbworks.com/w/file/fetch/144720714/saxon_math_course_2_download.pdf
    • http://duziruromeja.pbworks.com/f/28217767316.pdf
    • http://siruzosu.pbworks.com/w/file/fetch/144802014/16839736092.pdf
    • http://juvupumanut.pbworks.com/f/zijoja.pdf
    • https://uploads.strikinglycdn.com/files/574c435c-e7c7-4752-a1f1-82946c7f5e1a/59776404658.pdf
    • http://lojefizowoj.pbworks.com/w/file/fetch/144620175/harry_potter_and_half_blood_prince_book_wikipedia.pdf
    • https://uploads.strikinglycdn.com/files/d8cd67dc-3726-4d52-b992-5d9dcd3e970a/temivaxagamubusebuj.pdf
    • https://uploads.strikinglycdn.com/files/94d86f60-6356-482d-95ae-18c3ae6e527e/english_composition_definition.pdf
    • https://uploads.strikinglycdn.com/files/2ce4f5d4-d451-4df0-a4f6-987c762e1179/holy_quran_download_free_for_mobile.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea31.bin
3680611012416849be711d695a21f8d7d0bb4131f83b0b13d0c245827f6dc972		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5520 bytes
font_01_sfnt_off0000fce6.bin
89b9b96fb13bb44905855529a43d9ed0f1ced541d17e7fb017293402d82b1b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10156 bytes

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