Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74808638fb9887d…

MALICIOUS

PDF

77.0 KB Created: 2021-01-08 18:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c85a67522f6d8a06914767eb5d33c3eb SHA-1: cb5259704de3f0cac31d350b2839efddf98d036e SHA-256: d74808638fb9887d712c65fe03b4aedfae55c54148a850325d5db756e102b316
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=kendo+ui+angular+cell+template PDF link annotation
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/gezejidominujunaruza.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/6212683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5fc133bf0faad.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/dda06e1.pdfIn PDF document text
    • https://cdn.sqhk.co/gobopovupav/SKgiibS/box_packaging_mockup_creator.pdfIn PDF document text
    • https://cdn.sqhk.co/rotogogoji/hdzjaAy/flipkart_grocery_re_1.pdfIn PDF document text
    • https://sererewaxux.weebly.com/uploads/1/3/4/9/134903335/pijulip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fcf6e8a4550e.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/Iw7ljiC/8723855983.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jawjiji/ortel_mobile_flat_tarife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dae02fda-77ea-4517-bcb1-e49602b66270/breve_historia_de_mexico_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b658af-9404-45c5-919c-2834e0de63aa/malimofexopedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ef3a74-13bb-455b-b527-5d304db47c0e/electric_spark_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43ad3ab-921b-40b3-8a25-13ecfbfad61a/nudos_y_amarres_definicion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 5064 bytes
SHA-256: 9cf90bd0d0c0c458bbafdbf72349fb82a254512dbae4037fc4d7a8927c44a6a6
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 12184 bytes
SHA-256: 39b84bfde22ce18ec3916e2dcf47cde0190e20be34b1e0b709072d7149433f96
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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