Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0b2a7714b6e50b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-19 07:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b663194e3319cfd550a2fb9cf9641ddc SHA-1: c8c7ed2f34b36e67bc7e2ccfb1ff22c2d5ad17a3 SHA-256: bc0b2a7714b6e50b2c4f33d11d8293b2b0f93ecdb59a9f72c101a7b8fed04173
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/wix?keyword=all+the+bright+places+book+pdf+full PDF link annotation
    • http://conicppjry.bid/peop_model_occupational_therapytkcha.pdfIn PDF document text
    • http://teachost.com/hyperlink_to_sheet_in_excel_from_wordnr07h.pdfIn PDF document text
    • http://titanovyi-filtr.ru/fujivexozefojefekotenarnubiq.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/lojexujujixop.pdfIn PDF document text
    • http://whalesqpa.fun/435447532736hjc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_56940aaf916e4218ad4f62f0bb57023c.pdf?index=trueIn PDF document text
    • http://wemaxoseni.myartsonline.com/deled_assignment_front_page_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca1608b-99ed-40ae-9145-ffeae5b7c702/44316864687.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_34095ac8fe754753b3407dcbc1677d7b.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_682ed7a5b8a34c028bc8b80986d73b39.pdf?index=trueIn PDF document text
    • http://jowosos.myartsonline.com/causative_advanced_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e310346-e165-48a7-8e4a-e54b72a58ee3/nj_transit_monthly_bus_pass_zone_1.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_8e8562bb6fde4259a721b7b00316ee7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/716479d3-3928-4fb8-8fc4-4eee9e75697c/44420622940.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_0b8897eae66a4f1d8a31a430837fab50.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_7ce6734800384b9cbff13be224183763.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_c537b8f3d04a4e31b305a5729c3a1936.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_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 5612 bytes
SHA-256: d18665af0177964fad21507a6b71d37bf2f0984d4a925be9d35fedc00f477b95
font_01_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 11564 bytes
SHA-256: 81f479adf5043955cf819d1e01b5e8903bde0c41ff0d05646cb62f88bf4990e4

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