Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a93f27b7bc24e1…

MALICIOUS

PDF

71.5 KB Created: 2021-03-05 11:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7bb6f429919f3cb1d412e62c48de2778 SHA-1: e5da0ffa80ef5a953c36d5608534e2d0b496cce0 SHA-256: a2a93f27b7bc24e199fbdfa7a51344e42b31264c7b58fcfb39116e6f5b2cadf8
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including brand impersonation for credential phishing (Amazon). It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or redirector infrastructure. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing lure designed to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lojuxilowexez.weebly.com/uploads/1/3/4/3/134321299/viwos.pdf.
  • 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://gimoguvi.ru/strik?utm_term=the+gift+of+the+magi+commonlit+answers+key PDF link annotation
    • http://shopbest.online/16599372395aywmw.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/gone_michael_grant_online_book.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/ping_pong_rules_does_the_ball_have_to_bounce.pdfIn PDF document text
    • https://lojuxilowexez.weebly.com/uploads/1/3/4/3/134321299/viwos.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/e18ce310.pdfIn PDF document text
    • http://hopecommunitynaz.com/anatomy_for_sculptors_reddit1c9gz.pdfIn PDF document text
    • http://allfreebets.ru/685437393561xtro.pdfIn PDF document text
    • http://igafnd.org/permutation_and_combination_iit_jee_notesxp9fm.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/tivogulutetifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_b4797c0243524c698130f10f578470ec.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_7911f9ce312d42f8b868bfced4de1e9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/936fc0fd-6308-4b1f-8b90-8334be98f9f7/rt-ac68u_install_asuswrt_merlin.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_9944bd1ec1a94750a88a6d52aa82f479.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_2f5557faffb048e3a85977d75cab4c29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e578189-5337-4815-a55d-ee32290c83e0/short_story_length_for_publication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499fd944-b70a-4a7b-be7b-9b0623d94c79/vopotiduxudiximujogo.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/john_deere_x500_48_inch_deck_wheels.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_f126f7e965fc475f935bdfad61127a9f.pdf?index=trueIn PDF document text
    • http://sukokovevaz.atwebpages.com/i_am_a_man_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249b3c0e-2f85-44bc-a793-ac8d29004c92/ginukin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 2872 bytes
SHA-256: ea18d12de3b231b305d916e97a9b3fe700a81a38429b6dccd25d7533a54d13f8
font_01_sfnt_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 5504 bytes
SHA-256: 45e541a51d4184112c428599907d04d23b359adab4acf4835091effa786d13b1
font_02_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 11056 bytes
SHA-256: 3f31e01be802a447b27d62b35e8b946ee8c42805928d9d5df816eb2edc22a644