Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8c5c5774673199…

MALICIOUS

PDF

78.9 KB Created: 2021-04-24 12:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a0928c62976a4dcade2a03b721bcd9ab SHA-1: 0eec7b1ef498b55efc094ab9d6c4d921168bf966 SHA-256: eb8c5c5774673199c9518b5fbd3407294f6c80528392d92945e0b81ef45fde60
184 Risk Score

Malware Insights

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

This PDF document contains multiple links to external websites, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'Covid test driver jobs'. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a phishing or malicious redirection 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 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.
  • 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://dafemum.ru/strik?utm_term=covid+test+driver+jobs+manchester In PDF document text
    • https://gunanase.weebly.com/uploads/1/3/4/4/134488627/3980169.pdfIn PDF document text
    • https://sawawinuta.weebly.com/uploads/1/3/1/6/131606003/gerevofimawa.pdfIn PDF document text
    • http://fruktovik.com/throne_of_glass_series_publication_datespx51r.pdfIn PDF document text
    • http://pufisiluvapugif.22web.org/farm_and_workshop_welding.pdfIn PDF document text
    • http://lnstagramoriginal.com/liebesleid_rachmaninoff_sheetnd0j2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_6065e49ce487b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_60063b2399b96.pdfIn PDF document text
    • http://100p-f.ru/along_for_the_ride_lyrics_tyler_cassidyatf30.pdfIn PDF document text
    • http://siwutasir.iblogger.org/tavupufuzilijolodok.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/arctic_word_search.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosiwamirofakad.rf.gd/canvas._todataurl_application.pdfIn PDF document text
    • http://bidetorula.rf.gd/soxefifazifipulogifu.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_922639a661c54befa400bda6b02d8970.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_73f39ac6195b407190aa0b50b6b75bd6.pdf?index=trueIn PDF document text
    • http://nobegik.rf.gd/72002563623.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_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 5328 bytes
SHA-256: 1516be4763d145265b18c8877b78ec726968c0190f22f156c3e01d1fc452d640
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 10924 bytes
SHA-256: d9da200dadf6cdc1fe7ab88fb9536c693fde41836eb41ac182fe07ed5a1d3570

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