Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc793063c4890a0b…

MALICIOUS

PDF

94.6 KB Created: 2021-04-04 08:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 13c4046fd8ac273343acef533039657c SHA-1: 002a0e980438040f110898b5554d71cbab8f3a2d SHA-256: fc793063c4890a0be6cdfb41307105322fa0933560febc127921c7c974d57a81
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/123?utm_term=aspen+plus+v10+user+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492580/normal_6000ba321d0fc.pdfIn PDF document text
    • http://damvglaz0.xyz/pamitigojalepovonuduvuma1p7lt.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/iiogjGo/73321476621.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/eghgiFa/rick_freeman_realtor.pdfIn PDF document text
    • http://everydayy.fun/39933298691flhi9.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/idDDyjg/pokisew.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/gfIgjjd/skyscraper_film_review_guardian.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/iham1ij/drive_in_theatre_dallas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_604ecf00470a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_60611d472529d.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/oCjgcig/star_trek_timelines_wikipedia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fc70d040e6d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_3dba4051a7bb47449603d29796b46170.pdf?index=trueIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_568558aaa11f4f94a9ddc5ac4ff820ca.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_4e94eb5f1d514646879551eb86f45abf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8566255-019a-49f6-b9ad-ca29ec65831d/saperatamejufusofirukuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146a7829-f49a-4352-a471-ee9662c18079/chandamama_kathalu_books_in_telugu_online.pdfIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_b629caceb33042e083c7ef718d5212e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8104b593-5e21-4978-845b-200196c0f1a5/basic_concepts_of_electrical_engineering_by_kuldeep_sahay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33110f27-0b8e-4a68-8fdd-79149be8558e/how_positive_self-talk_can_transform_your_life.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_4b631f1022654e0e9e7051eb5e051f23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c3d177-e370-4e92-85a9-0df79a3e56cc/how_to_put_financial_modeling_on_resume.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_off00013510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13510 5160 bytes
SHA-256: 04822d65f29f5bd9c35e560e58e44fb91122151ffdf5b73d4d626096a06770b5
font_01_sfnt_off000146c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C0 11236 bytes
SHA-256: d4aa1f2d60e0d56cb14cd46e8253c6fe1efcbbeeac24053544dc2f2722c8ee8f