Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba1f81a4906ec86…

MALICIOUS

PDF

82.3 KB Created: 2021-03-22 00:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b1ffc812f0113117d43386df1458632b SHA-1: 05d04a567e801e66fbbed464e2060e934a2a693e SHA-256: 8ba1f81a4906ec867d1e373e61a53017c917ff9c6cd341bc743a9d6f008dfe91
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this behavior. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or content distribution lure.

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://pelibifir.ru/award?keyword=auguste+comte+law+of+3+stages+pdf PDF link annotation
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/gotimepipedup_zadujazigosivoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_603e86fbe15b2.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/efMjdhk/59024819885.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/nudizetojaxemaje.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/Ihejchf/reluwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/4jiHMij/recover_text_messages_android_no_root.pdfIn PDF document text
    • https://nefawuwezogixo.weebly.com/uploads/1/3/1/1/131163734/5498440.pdfIn PDF document text
    • http://viwimewi.22web.org/arsenal_fixtures_19_20.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/f8pgid5/h_and_m_uk_new_size_guide.pdfIn PDF document text
    • http://xofazonir.iblogger.org/16467908604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_602295a84e9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_60543da7e2c32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_0caf7284942b47a58f2caf7757a1c403.pdf?index=trueIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_a66f1c93082c4d19a9ed0ca845d6d0fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb150a6-1846-46e9-b645-2be399409b75/how_to_use_the_ti-30xa_calculator_for_exponents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd2a1b1-17bb-467d-9699-9025f857ce03/vonerefazowaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d239b6-5470-4b35-8d79-bf84da5d1881/the_lion_the_witch_and_the_wardrobe_book_back_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56155b3e-0d7e-41f7-93f4-6d0ae7c22204/what_is_the_meaning_of_the_name_tanya_in_hindi.pdfIn PDF document text
    • http://todosix.epizy.com/corbett_maths_factorising_quadratics_answers.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_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 5624 bytes
SHA-256: 8e5af4af254d33f5741507e67fd494bca8fa9d997e617f6d22aa56160b582211
font_01_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10256 bytes
SHA-256: 19d5d0badff76affcc9a98e240c1af2cea2d4814b98e57f407d43d183c0d2eb5

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