Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cff88af04c52dcf…

MALICIOUS

PDF

85.0 KB Created: 2021-03-19 19:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b807bcde0640c2fcda509f8c3faf80fe SHA-1: 97369660cc8b396a3f0c18f76746877b17fbbff5 SHA-256: 9cff88af04c52dcfde4afe7616c11dae4ba2626af471b4300d32bc389bc15e7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, with one prominent example being https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/6771531.pdf. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/aws?utm_term=2008+vw+jetta+owners+manual+free+download
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/6771531.pdf
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/siretesu.pdf
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/tunufufexafe.pdf
    • http://retamos.mygamesonline.org/how_to_open_jbl_clip_3.pdf
    • http://xojuxelase.medianewsonline.com/what_tools_are_necessary_for_woodworking.pdf
    • http://wikotimu.scienceontheweb.net/zeros_of_a_function.pdf
    • http://gifinibufenatar.medianewsonline.com/bsc_sem_1_chemistry_practical_book.pdf
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/6399042.pdf
    • http://zawugudumi.getenjoyment.net/what_is_the_best_sphr_study_guide.pdf
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/baboxi.pdf
    • http://kozidozilujivox.getenjoyment.net/48329941342.pdf
    • http://manamuposa.getenjoyment.net/vafofamibagimazor.pdf
    • https://rizenuwav.weebly.com/uploads/1/3/4/3/134335920/4951543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wusone/apa_bibliography_format_indent.pdf
    • https://s3.amazonaws.com/kuxuxemu/93670908100.pdf
    • https://s3.amazonaws.com/vavapekadoliti/control_panel_design_guide.pdf
    • https://s3.amazonaws.com/jizubisetebof/fipetaso.pdf
    • http://xedawobu.atwebpages.com/karufi.pdf
    • http://sewemira.atwebpages.com/administrative_office_management_book.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/jotojixiduvalolob.pdf
    • http://valupakukav.myartsonline.com/big_little_lies_season_2_last_episode_date.pdf
    • http://fotizojorirepel.onlinewebshop.net/vodamolujam.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cdd.bin
874977180c960ee5ac8dee501c770ed0c8e91e5484ef6f7daba95f48f2879be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 5656 bytes
font_01_sfnt_off0001201f.bin
43480fc26f10aa918f87ad372338664fef2966fd5ffb35a9f37faa22246fd906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 11404 bytes

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