Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3bdb66c348bfdc…

MALICIOUS

PDF

75.4 KB Created: 2021-04-07 17:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c84ab900ff401e561aeb8b71d61a7ccb SHA-1: 82c350959d10324c750f4be3d1a9451cf71092ee SHA-256: 6a3bdb66c348bfdcfca0ac402bb7868acf2fe93b20379d79e2c48cb95445e034
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. The presence of external URIs and a link farm suggests an attempt to redirect users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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=de+jogos+para+pc+infantil+gratis PDF link annotation
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/dokusasunalepokikuv.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/physical_activities_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/fanabezom/jehghck/26900325004.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/2gjShih/earthlink_mail_servers.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/G4iXii8/iso_9001_quality_manual_template_free.pdfIn PDF document text
    • http://raxewapikeb.mygamesonline.org/editorial_writing_download.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/xadimafote-nofopa-vemorazo.pdfIn PDF document text
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/juzebojabale-ranebubakafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuxotuketut.rf.gd/wudaripoverikuwugip.pdfIn PDF document text
    • http://zawipikeg.rf.gd/79236002505.pdfIn PDF document text
    • https://5db246a0-94da-4013-9f64-c970003367b9.filesusr.com/ugd/ca5179_37f7bb66e42247c1ba295b998eed0b61.pdf?index=trueIn PDF document text
    • http://bofametif.rf.gd/kaththi_theme_masstamilan.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_2c868969d4af47b782816c977c250c51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ab9639-e4e5-410d-9a27-f0b0c9e8f44c/what_do_the_buttons_on_my_adt_remote_mean.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_9819d3598f1c4dd18dcd25cbd0ae8b39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/312ba4ab-ce5e-4b72-9ee8-99178564a84b/area_and_perimeter_of_irregular_shapes_worksheet_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09ccd91-26ca-482a-bfe2-8179dfb6da16/is_there_a_torah_in_english.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_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 5256 bytes
SHA-256: d96d191941fc1e20d7a3da4dd8a02a916c92b783bdc3baa6731ab1e1698b05d8
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 12928 bytes
SHA-256: 61562d7436ecffffd721cc5f554f81157a42f070a84b615fca18cd0188ea3337

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