Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4105071ffa60a4…

MALICIOUS

PDF

82.2 KB Created: 2021-04-25 06:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9cc63dff28f770ba1a5434161488af5a SHA-1: 88fd24ac07079be714b2f816db4f5db411c77061 SHA-256: ec4105071ffa60a44f48be362d3a5fc9dbcd4b9245b821b59ae00ea746af692e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to its generation, and the presence of embedded URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/strik?utm_term=i+am+meditation+music+wayne+dyer PDF link annotation
    • http://rujisuki.mygamesonline.org/32484418132.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/jipenukabixuwapeka.pdfIn PDF document text
    • https://loremodowudoro.weebly.com/uploads/1/3/2/7/132712063/xitezalusu.pdfIn PDF document text
    • https://kijesutezex.weebly.com/uploads/1/3/5/3/135328712/40f4193f79f7b0b.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/xidujetofisoge-sowagimipemid.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/ftieAig/64145863920.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/abstract_reasoning_test_with_answers.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/bbeee7.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/YW7iakt/65270849546.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/qhcwjdE/hd_wallpapers_for_macbook_pro_13_inch.pdfIn PDF document text
    • http://newoxinap.66ghz.com/81950910676.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/matlab_for_loop_sum_matrix.pdfIn PDF document text
    • http://vadirikolofifi.iblogger.org/17076499361.pdfIn PDF document text
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/mugutabodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_27b9c25d781b462293c074912d0427fe.pdf?index=trueIn PDF document text
    • http://wuragumok.atwebpages.com/neurogenic_bladder_dysfunction.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_17c3b9edfe0449179c8d447870fae998.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_84a4d77e9d804dc7b6d5559582ac602c.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/51845890539.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_8361a4cb922d4b11a1dc64bea54b4147.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_41bcafc27d434a61a847886cf71b3b78.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 5184 bytes
SHA-256: f9f1b9e444946e3f578758f0b85237c28be372a80c3041ec174107507ab222e0
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 2128 bytes
SHA-256: 1757e9b21583d324d419cc79f07ea3b967ec962ebb57f4057bcf2fb90cc0d392
font_02_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 11464 bytes
SHA-256: 377027881322d7f0f5121857ba3b2cc833be1a8da51269c170e448122fd655bf