Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1fae623b6d7588…

MALICIOUS

PDF

73.2 KB Created: 2021-04-24 15:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 978c88003bbc20f2cf2feb102898d9be SHA-1: 43066b8fb313a8df15197b544abcc41f6285acb5 SHA-256: 7f1fae623b6d7588cc39338b7f86058eaf1893c86a2dc0d9e2ec1fe4f07e0d81
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=libro+de+fisica+universitaria+volumen+2 PDF link annotation
    • https://cdn.sqhk.co/ponesigis/gAChie0/pudenirepamixulu.pdfIn PDF document text
    • https://cdn.sqhk.co/jepinixawide/bghjahh/katabatic_and_anabatic_winds.pdfIn PDF document text
    • https://cdn.sqhk.co/wasulevilid/Wmkuhca/vuruvozavinemivo.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/F5A1Vie/hungry_shark_evo_sunken_objects_map.pdfIn PDF document text
    • http://babobekoru.66ghz.com/78224247739.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/g2EyjjP/93402095281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/divine_names_dionysius.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_0da6b574545a4e7693d945f104e6cce8.pdf?index=trueIn PDF document text
    • http://vudazirukileri.epizy.com/rewasakis.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_c75b18d301e249afabf21abfa122f6ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojonuta/chibi_papercraft_template_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/92307067941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aada0d9-66b7-48af-9df9-7775c6bc87bf/what_does_pist_stand_for.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/assamese_bhakti_geet_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76d9d22-ae44-4b50-a7f3-1e27a3baff3d/18608459170.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/what_is_family_life_cycle_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/sogon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9d5001-129e-4686-a3b8-7e85f90a8ed5/6.0_powerstroke_oil_cooler_location.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_41f1c707f4434b3e8c65d60044d9b1a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/82234194351.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/mokunepulexit.pdfIn PDF document text
    • http://gozosowizopuk.rf.gd/hp_laserjet_pro_400_color_m451nw.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_220646c6c03049c48c9f47eb006edf6b.pdf?index=trueIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_c27d57e3171d45b6a28d329788036dd7.pdf?index=trueIn 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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 5440 bytes
SHA-256: 0df6c13a4b8ae4b5cb551707f7ae16ba0b59542929bd924883cb2b054a1dc09f
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 11276 bytes
SHA-256: 6e80dbc382b5370cfaa94376932a3089239791257c0192d213b8fd03d27c9761

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