Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c25c99225871a54…

MALICIOUS

PDF

75.3 KB Created: 2021-01-04 19:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e37552a3059bdec348fa93c919fb766a SHA-1: 9ec4d242bc6c8f968f3fae137936e6063aa2ea1a SHA-256: 3c25c99225871a54fd411e351b0786747de80e7177158763a8c856d6b1016a37
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a mass of links, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=any+video+recorder++mac In PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/1390732.pdfIn PDF document text
    • https://bapadiwifujeki.weebly.com/uploads/1/3/4/0/134041393/vavepibokodiginal.pdfIn PDF document text
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/fe3a4fae7c609d.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/74c7856bc0c4c44.pdfIn PDF document text
    • https://zavewixesareput.weebly.com/uploads/1/3/4/8/134855174/sudivuzekiw_saruzada_mexewoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9fcabf-1cca-4067-84ae-a9976b93ec57/square_of_a_binomial_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859d91bf-7f64-4082-ba07-3c02eb63b947/webonumonugulebugarot.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/trial_objections_cheat_sheet_federal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d5544e-aa38-42b7-918b-75ffaa735d9d/can_bearded_dragons_eat_grapes.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/93317050925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1868a0e5-df68-419b-899a-f21fbb1949eb/msbte_model_answer_paper_summer_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0291843-e545-4efa-a387-ea75d28e8953/tuxukadafarutetavetur.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/butler_font_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/liszt_la_campanella_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21675a01-5529-4eb7-907e-7ca3c8912bf9/mobizumimamomomasoveri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7ccd00-c75c-4ece-b8cc-b8cb2bbfa12f/208254685.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 5024 bytes
SHA-256: 2ef14d82f04579247f9de74fa220204c49803d214b8c1be8fcce0d5782a4c95a
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 11060 bytes
SHA-256: 49ce1ff723b172e902919a02f6d111bbf03b6364fa65b99c49c209de9924aded

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