Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdb0f5e2ad2038c…

MALICIOUS

PDF

71.6 KB Created: 2021-03-03 20:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ec550acc07dc32bb6f62d27ed8c32bf4 SHA-1: 4fbbda6bdea9975cc00dbc3e188ed21fc2f460bd SHA-256: 4cdb0f5e2ad2038ce51818f0714a6965a5f96d93573876fa4fd106dc5c9bb6cf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to textbook downloads, suggesting a lure to entice users to click on the embedded URLs. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=physical+science+grade+12+platinum+textbook+pdf+download PDF link annotation
    • http://copyrightshelpcenter.com/what_is_the_theme_of_interpreter_of_maladieshp0gs.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/libros_de_harry_potter_en_espanol_para_leer.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/dogedinisavakogawunule.pdfIn PDF document text
    • http://wonder-ita.fun/86408290870tw15t.pdfIn PDF document text
    • http://ligazilafibab.22web.org/calvin_klein_female_underwear_size_guide.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/c089d1e.pdfIn PDF document text
    • https://gewujamagig.weebly.com/uploads/1/3/5/3/135339218/meweteru.pdfIn PDF document text
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/601ba2b64.pdfIn PDF document text
    • http://vvd.bar/oracion_de_la_quinceaeramzohd.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/iagghj6/big_bang_cast_members_now.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bamefifib.epizy.com/el_pollo_loco_chipotle_chicken_avocado_burrito_ingredients.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/bogugo.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/farov.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/practical_english_usage_4th_edition.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/chevy_cobalt_maintenance.pdfIn PDF document text
    • http://narivisifan.rf.gd/50008720183.pdfIn PDF document text
    • http://gumenunusukuk.rf.gd/mp3_to_midi_file_converter_software_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/ccleaner_apk_android_2._3._6.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_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 6100 bytes
SHA-256: 40a03dfbc307792f15936f359a2c5f7952dac33a5034fa6b6180ac9e8224f4c6
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 10288 bytes
SHA-256: b15f7da99aa7b7c9be576b8eec738bebe2238907eff6fa98c1e1627b61002133
font_02_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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