Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1cf4103be285ad…

MALICIOUS

PDF

111.9 KB Created: 2021-04-15 00:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a5ad0c7113cdf25a5c9d2d0ec182ff24 SHA-1: c4512cf240de9bd00abe1c62eda411544b7169cf SHA-256: 8a1cf4103be285ad614d7dc000b3945af67fe2bde7bc268cefa6e7197a43ab10
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://jacksth.ru/strik?utm_term=pet+sematary+reference+in+castle+rock PDF link annotation
    • http://kusoxesarudomu.22web.org/lookup_function_in_excel_2020_with_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_6064c7f76d951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_600532a01ee93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5fc642b4a0901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_602e40b3a2b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5ffb46b8329b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_60367833b9d76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fec87cbd3571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_2071c3a818b046cc92057f697d86ec75.pdf?index=trueIn PDF document text
    • http://zotubetujuna.rf.gd/character_recommendation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e817847-034b-4c5f-8b16-50058d0a8b15/speed_queen_washer_error_code_e_fl.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_d1c7da272dc5431e93f171c69d918bbd.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_6c9e51e9c32442dd98a05f6bd6f1cce1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8ea5cb-c077-4e77-b8a1-d1d54d0580a8/96031090966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4a1145-658e-4a10-ae89-569178d0fdd5/miroropolewetufofolomoxix.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_9574d50b19894d2e812630ddb1ac3840.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ea25c2-65e8-4720-b600-cf24c02e509a/oracle_sql_concatenate_strings_from_multiple_rows.pdfIn PDF document text
    • http://xilavivugup.epizy.com/work_placement_report_example.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_fc8d946715a340708933b5b099085157.pdf?index=trueIn PDF document text
    • http://dadonugila.rf.gd/tomiwedu.pdfIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_c2cf745a7f364e489d90be6ff53f8ffe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c65170-ae8e-4353-bc9c-6e3d6ecd2405/gijixadevunikalubedaw.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_off00017791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17791 5192 bytes
SHA-256: c8d97f0045d661381605cbd1483343fc9296a8de19a2a738f432f26cf17d33ce
font_01_sfnt_off00018934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18934 12404 bytes
SHA-256: 75c1df07793e92ca96445650de8d27dcd943eaba69669bf89addc113e0342345

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