Malicious PDF — malware analysis report

Static analysis result for SHA-256 718980f21bf3c7e9…

MALICIOUS

PDF

72.9 KB Created: 2021-03-28 05:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bbfa6b96656539cc6f324954cc818aad SHA-1: f206a18a0535d20ba0863daded19c56201fb9bce SHA-256: 718980f21bf3c7e9f9398fb05715a083c768dbae8c4caa2b8e956a8258682248
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a potential lure for malicious activity. The ML classifier strongly indicates malicious intent, and the presence of numerous links suggests a link farm or phishing attempt. No scripts were extracted, but the document's structure and embedded URIs point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://midufefew.ru/award?keyword=applied+mathematical+modelling+of+engineering+problems+pdf PDF link annotation
    • http://ruvinowuge.scienceontheweb.net/40281788184.pdfIn PDF document text
    • http://probmaka.tech/28434203789u1zi0.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/rutizetutur.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/9728718.pdfIn PDF document text
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/adb4eb65.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/jowowad.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/gajuzipolon.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/accounts_payable_and_receivable_process.pdfIn PDF document text
    • http://zeropium.com/30_day_no_sugar_challenge_resultsucigl.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/bikuvu.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/bella_durmiente_cuento_original.pdfIn PDF document text
    • http://gloslides.com/poletodefuteplvcj.pdfIn PDF document text
    • http://bamimutekinawaz.22web.org/chameli_bhojpuri_movie.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/videkatuwola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noratev.myartsonline.com/safety_insurance_glass_claims_phone_number.pdfIn PDF document text
    • http://josesomesube.myartsonline.com/39016745185.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/xufug.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/gizadamuxagavikuwosiwevu.pdfIn PDF document text
    • http://vipotuzazaburew.rf.gd/zukonon.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/fanuzixujuxo.pdfIn PDF document text
    • http://bufagefitazi.rf.gd/brother_lock_1034d_spare_parts.pdfIn PDF document text
    • http://worurekebisur.rf.gd/38701231489.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/tutidawuneja.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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 5700 bytes
SHA-256: 2a3f1d12675e2da95633c6a3f7addf5e93814ef4eac67da8773e94ee24e45d4d
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 11020 bytes
SHA-256: 3f251712ae2eb889a5c2f3d243df818eb7ffef531ae96fbbd83465b204bc359b

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