Malicious PDF — malware analysis report

Static analysis result for SHA-256 064a634443825311…

MALICIOUS

PDF

75.6 KB Created: 2021-03-16 15:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0998873c58be9aa680cea86b696e850a SHA-1: 599f87182093face7e495ce985a1c61b35cd0bfd SHA-256: 064a634443825311e1c9ee1c9dda003e246f7886f44f3ad242bc0d68a339d3fc
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 0.9995

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://zajinet.ru/award?keyword=academies+act+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378175/normal_604837d24a4b1.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/the_sewing_book_by_alison_smith_free.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/rinnai_r85_parts_breakdown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450337/normal_6005b30dadc7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_6008876b5ddf9.pdfIn PDF document text
    • http://fukikenikiru.22web.org/43253482550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453335/normal_5fec132250a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_60401a4fe33c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatoxat.atwebpages.com/les_expressions_en_allemand.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/digraph_and_diphthong_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/stealth_cam_stc-p12_not_working.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_abbbf9b22f844378b0fdaeee81b4110d.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_a682d99577334a5a81c6927de0de54be.pdf?index=trueIn PDF document text
    • http://jexamovofu.epizy.com/dopugosi.pdfIn PDF document text
    • http://relelefaxup.epizy.com/electronic_configuration_of_bromine_in_numerical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/action_video_clip_free.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/intrinsic_pathway_of_apoptosis.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_6734c857b74a4004b2ba233cb4d16da5.pdf?index=trueIn PDF document text
    • http://mawokale.myartsonline.com/72875195370.pdfIn PDF document text
    • http://sumojoripira.rf.gd/is_hail_damage_reported_on_carfax.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_5332f0cefd124dda89a48a367e6d7367.pdf?index=trueIn PDF document text
    • http://dogabofeki.epizy.com/learn_python_the_hard_way_online.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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 5436 bytes
SHA-256: 8aeb0dbdc2bc9dcaf225ceb22050e244be89ea711bec55616dbc1f510e62324f
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 11256 bytes
SHA-256: dc2a096b0a7b581d4be5dbc9419ab823da5df323b2c80d670d8a6f905f926afa

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