Malicious PDF — malware analysis report

Static analysis result for SHA-256 a983392fa3f02d5f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 16:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ad7c0e26996928d3401c887cede5e67 SHA-1: 95ce432287c987f4796b3ac2a56ad5d3cea1b4d7 SHA-256: a983392fa3f02d5f0aa60bb0a223e6272889b2399fe8f129e8efe09f120e622e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/123?utm_term=biochemistry+and+biophysics+reports+fee PDF link annotation
    • http://kuboduzuke.mypressonline.com/42808604117.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/longman_academic_reading_series_1.pdfIn PDF document text
    • http://easylearning.space/davodamawogomakopomubizm0d.pdfIn PDF document text
    • http://hhizmet.com/forgotten_bullet_shrinezdowm.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/lekuz.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/h1LhgAA/zonusa.pdfIn PDF document text
    • http://winoorama.fun/bhc_full_form_chemistryr3w0g.pdfIn PDF document text
    • http://chunyoo.com/rolazzc8vf.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/LqSjcig/miwekebonibujefeloz.pdfIn PDF document text
    • http://baltika-trans.ru/hosanna_chords_kari_jobexf8re.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/iE8qUia/air_hockey_challenge.pdfIn PDF document text
    • http://bet-info.ru/samsung_refrigerator_model_rs265tdrs_manualdrte1.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hdjiahd/37935886429.pdfIn PDF document text
    • http://uanews.website/rpcs3_skate_3_downloadgncwg.pdfIn PDF document text
    • http://lishop.site/90695025179rpv0i.pdfIn PDF document text
    • http://ingmijn.com/oxygen_xml_auto_formathvf7c.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.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/cbeefe1b-c8d9-4005-aa49-417caecdfef8/personajes_principales_de_cien_aos_de_soledad_con_sus_caracteristicas.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_e8102d33ed4749be9bf7ae52c741a40d.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_5a7efb6e15a343ad831b8ea561b0700a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfd7415-a2b0-43c7-9cad-b612c5cfc411/lakonozupatavekugilib.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_e4f9e709aa944513b4675b95336d6c30.pdf?index=trueIn PDF document text
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_d7171b328cb3462e9a976d6a2a441a02.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_c25ba7a7fbe448cabbf949a385f948c2.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/fiddler_on_the_roof_songs_movie.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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 5652 bytes
SHA-256: 52147df403419dafd3ed70927c1a40a7117a9a6590a9c997aba87f4823db909d
font_01_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 11440 bytes
SHA-256: 209774c6ad6b9763b1a5acc893047754d9c10cf6184d56e860f982252041234e

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