Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cffb606e27c54f…

MALICIOUS

PDF

80.0 KB Created: 2021-03-06 14:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d3b0aa52dada196538bfbce8d24b883 SHA-1: b58657d6bf95de525f31eea2aa43bc157c03f84c SHA-256: a1cffb606e27c54f838c5a6dfa947bf662dcd81b69364cc991809ce6bbfbbf81
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing obfuscated text that appears to be a lure related to 'El mito de la caverna de platón completo'. It embeds multiple URLs, with a primary suspicious URL pointing to a domain known for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://golowaki.ru/123?utm_term=el+mito+de+la+caverna+de+plat%25C3%25B3n+completo PDF link annotation
    • http://prostotit.site/41479175360d6amj.pdfIn PDF document text
    • http://monstergym.ru/rimegalelanigome5upfk.pdfIn PDF document text
    • http://naturfresh.space/dovenonaxutebakataje9k1n6.pdfIn PDF document text
    • http://bonmarket.site/advanced_database_management_system_notes_for_mbadz89c.pdfIn PDF document text
    • http://bluetea.space/android_easter_egg_che_cosy5ka0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0af5dc6-ebb7-4907-a03b-2e148156a7f2/how_to_train_your_dragon_3_cast_voices.pdfIn PDF document text
    • http://defozuwonig.rf.gd/evans_partial_differential_equations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ed139f-2059-4ba3-a335-7e8ba09a1caf/should_the_word_presidential_be_capitalized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac8b078-33b8-4c9a-9b86-b648671d9fce/burikevevor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6758950f-04e9-465e-b2e7-f35213d39c0e/does_shark_warranty_cover_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/woxumemagaribavim.pdfIn PDF document text
    • http://pipejogavumem.epizy.com/day_bang_roosh_v.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f9e9aa-2d39-4b20-89fc-42ab93b8f397/32519215763.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/impedance_audiometry_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/wogix.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/bloody_roar_2_android_mobile_game.pdfIn PDF document text
    • http://jidoreno.epizy.com/4582858146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565cbd7d-343e-4412-bcbc-8fe94cf77515/79964521793.pdfIn PDF document text
    • http://magivuxitafexox.rf.gd/sql_server_2016_developer_edition_msdn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd30acd-b2c3-4332-98fa-8e22b5db442a/social_maladjustment_meaning_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/riwimunalakita.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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5192 bytes
SHA-256: a6ab00d954b3ceaecc90c3d4d373c35bba84a480c805d1f27364f77ff6b58c90
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 12020 bytes
SHA-256: 2efde3f82ae95672f8c75bddf8c18eca45054d6b356ffecf1ec59c702c1c86a7

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