Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fd9d458006c00b…

MALICIOUS

PDF

90.0 KB Created: 2021-03-30 20:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef6903c5bb7de23cbf1e804c73f1615b SHA-1: dc8caf564508a70bca31c4f04932d60dd22842ea SHA-256: 31fd9d458006c00b73a563ffa2a9ef69260bf7d961c23e82898c8fa0e515566b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=bangladesh+baggage+rules+2020+pdf
    • http://megopoveguvujal.medianewsonline.com/93744295226.pdf
    • http://janafan.scienceontheweb.net/the_advancing_guitarist_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://roporuti.onlinewebshop.net/utilitech_three_outlet_outdoor_timer_instructions.pdf
    • https://s3.amazonaws.com/pusolefosex/gugexotezusujevino.pdf
    • https://s3.amazonaws.com/rirusozo/vanity_fair_book_recommendations.pdf
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_88cf0cca48484937bcca57e84bcf471a.pdf?index=true
    • http://gudugapapilile.atwebpages.com/negamonewulusagov.pdf
    • https://s3.amazonaws.com/boduxatavepe/windows_10_enterprise_activator_exe.pdf
    • https://s3.amazonaws.com/xeroguru/kerarowug.pdf
    • https://s3.amazonaws.com/gumagabu/8316051156.pdf
    • https://uploads.strikinglycdn.com/files/9bf88cea-bda5-4f95-8e38-81f1cf7a7936/diberagopunomuj.pdf
    • https://s3.amazonaws.com/vinejivunitego/summary_of_the_laws_of_prosperity_by_kenneth_copeland.pdf
    • https://uploads.strikinglycdn.com/files/65ed6a50-0381-4dc5-a248-29afb45c55bd/2o11_bass_buggy_pontoon_boat_w_trailer.pdf
    • https://s3.amazonaws.com/tejuvonixag/crochet_for_beginners_easy_traditional_granny_square.pdf
    • https://uploads.strikinglycdn.com/files/40d1123f-6563-474f-a05f-ca2cdc902621/wd_my_passport_ultra_reformatting_for_mac_os_x.pdf
    • https://s3.amazonaws.com/tutapaxi/fafepuju.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_dee857bbbcd145b19b56922c4df8c0a4.pdf?index=true
    • https://s3.amazonaws.com/xifabilejilab/joditakobaviruxigi.pdf
    • https://s3.amazonaws.com/warapagefasovi/2029481715.pdf
    • https://s3.amazonaws.com/remeranexe/6694653434.pdf
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_90245b2ba8a4458ba2cb33d7fd893431.pdf?index=true
    • https://s3.amazonaws.com/babetafaperaxov/vozirasujevikixigumumub.pdf
    • https://s3.amazonaws.com/faluzotixupi/reading_comprehension_workbook_grade_5.pdf
    • https://uploads.strikinglycdn.com/files/8827583f-165d-4713-a4a2-2e88b098784f/what_is_the_difference_between_central_and_peripheral_chemoreceptors.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_b13c45193e1c45ca820e692798a3ebb0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113fa.bin
1c632110a94f5ceb5f4ec791e263347915d8ca2be04044583b1d92bdc18c6326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 5412 bytes
font_01_sfnt_off00012646.bin
cf354491b8a13abdb9a888962f32d13f4cc025ca08b6a79bb304ec4bf34bdc29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 11116 bytes
font_02_sfnt_off00014c2b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2B 4324 bytes

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