Malicious PDF — malware analysis report

Static analysis result for SHA-256 d694c4c1ac17c84f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-10 15:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cfab1218a9b9a10e647770525a7a4c3b SHA-1: d23db218a46058d4bfc9d0d0bc93ed0c4f7533dd SHA-256: d694c4c1ac17c84f4f23360ea4ad7d104535788e7a72bbd4997d0f8394c765de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, indicating a likely attempt to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=best+rainbow+quotes PDF link annotation
    • https://cdn.sqhk.co/miviterul/ajcggYi/12956409897.pdfIn PDF document text
    • https://cdn.sqhk.co/rotusorukazi/hhggha5/mugudexinuja.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jejjjjB/demusowatudazotuleposogu.pdfIn PDF document text
    • http://selectgetc.top/13444415804ba4p5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_602a10cb46ec5.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/jPgeiet/labamemudiwokobovajufomew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_600c5faec69fe.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hjgIeUj/53412825513.pdfIn PDF document text
    • http://dalnoboyi.xyz/manual_de_terapeutica_medica_salvador_zubiran7ykbz.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/73gvS7w/vofabovidunodilekogesujes.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/rhiVXhc/ducks_unlimited_jobs_canada.pdfIn PDF document text
    • http://parkji5x.xyz/vamexusagabavobatuobwzv.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/QjjjdnM/fasubiwojowogujemonetagit.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/fUjgd5j/52095910229.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jOegcrP/secure_voice_notes_private_notepad_with_lock.pdfIn PDF document text
    • http://antinomi.design/interior_designer_jobs_houston_txvgmvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_60299d0a10731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fdde1866a009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/emerson_flat_screen_tv_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/reradigopenoreduxiwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/54520348858.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/67611199978.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/beko_washing_machine_7kg_user_manual.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_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 5056 bytes
SHA-256: d4bf22cdd4b2593915b43f20c336c65b02dbd85dbd2be423bf0e5abd7dc28a3d
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10140 bytes
SHA-256: d9cfd63d68eb77cd217219ebdc3951a064de5f41b3b4e9ee8202b67622fed365

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