Malicious PDF — malware analysis report

Static analysis result for SHA-256 c873eaed018b0148…

MALICIOUS

PDF

90.2 KB Created: 2021-03-28 07:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 266588bb85c6fea8fc41f0dd78e6a584 SHA-1: 311c81d4f7bd7c557124a2fc0050d7debae897ad SHA-256: c873eaed018b0148b270cfa58692dcd9438a7a72e15035d12b992af1f2e03742
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The primary external URL observed is vilenefex.ru, which is likely used to host a phishing page or distribute further malware. No scripts were extracted, but the PDF structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://vilenefex.ru/strik?utm_term=testimonio+del+pastor+rafael+ram%25C3%25ADrez
    • https://cdn-cms.f-static.net/uploads/4476011/normal_603058fee02ac.pdf
    • https://static.s123-cdn-static.com/uploads/4415308/normal_5fcd5bf27956c.pdf
    • https://mejofeva.weebly.com/uploads/1/3/2/6/132681501/8936413.pdf
    • https://cdn-cms.f-static.net/uploads/4374522/normal_600b5459d1330.pdf
    • https://cdn-cms.f-static.net/uploads/4387419/normal_601cfc2630dae.pdf
    • https://static.s123-cdn-static.com/uploads/4476281/normal_5fdcb39511753.pdf
    • http://adachivia.store/computer_network_architecture_bookskyefa.pdf
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/puradogetapojemosin.pdf
    • https://static.s123-cdn-static.com/uploads/4459777/normal_5fe34cc66e90c.pdf
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5ff4da1bece9b.pdf
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fe58f930a779.pdf
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/9651883.pdf
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/f43b71f353b.pdf
    • http://fortuneo.best/10013401962jhxgs.pdf
    • https://static.s123-cdn-static.com/uploads/4445745/normal_600522ba38357.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://static.s123-cdn-static.com/uploads/4456387/normal_600610a1e1c80.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59716e35-11c2-4e2e-9935-5629a7e64a43/26556659994.pdf
    • https://s3.amazonaws.com/nuselufuzo/govokavamekasorujuvum.pdf
    • https://uploads.strikinglycdn.com/files/dc3ab9ac-e745-44bb-8e42-234db4cf0a70/15770628639.pdf
    • https://uploads.strikinglycdn.com/files/8652c4ed-c252-4e8b-9c67-cf070d1bd8e7/trane_xe90_furnace.pdf
    • https://s3.amazonaws.com/tufujifinobiro/74989705555.pdf
    • https://s3.amazonaws.com/mudurixo/jejijumesibudop.pdf
    • https://s3.amazonaws.com/xefezesebusu/sig_sauer_p320_owb_holster.pdf
    • https://uploads.strikinglycdn.com/files/f37ac059-8e92-4d5c-8f60-816e746a5317/98362845238.pdf
    • https://s3.amazonaws.com/dazemi/cassette_video_game_for_android.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c6.bin
d5b953dd8db63a7a7dc1b8e48868703dc57d25bf7f19d5fb00092b162808540c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5240 bytes
font_01_sfnt_off0001087f.bin
5e75f48bc6e3b374ad22bf0f6e0225246ff65e4f281d597db49d43d981b361b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 5728 bytes
font_02_sfnt_off00011aa4.bin
11f9ccaaaf7bba52f4109162d75d0a5a151c3258d02f25e7c95e8fca62e91931		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 12108 bytes
font_03_sfnt_off00014223.bin
e4a63a88dbabdeb41b7ca080e69fb47747081b8eeda80042ba6e5bdb6cb2b4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14223 16392 bytes

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