Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffc51e16439a9ac…

MALICIOUS

PDF

84.7 KB Created: 2021-03-29 17:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb10c9cbc48ac5e248d685e0c9fa5788 SHA-1: 6c51a6114b2004ca66dee1da89da4c8d8d984763 SHA-256: fffc51e16439a9acc88211e26b505dab09e064b3b07904b648bfa449f76bf98b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrustworthy hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=effectual+entrepreneurship+definition PDF link annotation
    • http://trendmobile.ru/1072173802p1o1f.pdfIn PDF document text
    • http://lorezagosuvese.scienceontheweb.net/migiloto.pdfIn PDF document text
    • http://kolejuf.iblogger.org/swingline_gbc_letter_size_laminating_sheets.pdfIn PDF document text
    • http://copyrightreports.com/1805486180999ag5.pdfIn PDF document text
    • http://businesshelpservice.com/what_does_a_corporate_identity_consist_off9rzz.pdfIn PDF document text
    • http://teaapple.space/biomassa_para_energia_corteznsnav.pdfIn PDF document text
    • http://suwofuwokenedu.22web.org/acca_f9_bpp.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/kefekilafirezodadumewam.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/jumotemogaxaza_jozakevim.pdfIn PDF document text
    • https://fipubizibogu.weebly.com/uploads/1/3/0/7/130775584/fefogoz.pdfIn PDF document text
    • http://trenolgia.buzz/7299861380xj8yv.pdfIn PDF document text
    • https://lazetulomobepi.weebly.com/uploads/1/3/4/3/134326787/4912317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_102153bf42c74c059b725af6dd03aefe.pdf?index=trueIn PDF document text
    • http://bimagox.rf.gd/how_to_read_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/xexibo.pdfIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_3a0f68bcd98446a493ae1700bcf899a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wegugus/how_to_start_an_arc_weld.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/47453230449.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/novataxisogof.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_74496c864e8942809de27cb480540d35.pdf?index=trueIn PDF document text
    • https://eef50eb5-c47c-47bf-9843-15c7823b5fde.filesusr.com/ugd/e54fc7_9784b9e667eb4fb7b76694636859bbf1.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_19f1a495b17a4e52a9a901bbc10dbd33.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 5200 bytes
SHA-256: 18195583eb5c4207b2f786fb8d0fc598791e91364a266c84bae4d4d4a3225665
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 11332 bytes
SHA-256: 3764a378b63a0264a80d47138f6941aad6c2c3b3888df26a0998dfe2b9082a66

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