Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe6853e98e0f04f…

MALICIOUS

PDF

89.1 KB Created: 2021-02-19 10:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 348a615b2fd99c5f008a024fc79318c0 SHA-1: 3ef60853d1248bd2574a64a080c9b6d93311714c SHA-256: 4fe6853e98e0f04f315c225eb38b6dbadd067b9a3e420db8a8925dc81a7f236c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/123?utm_term=toro+snow+blower+repair+service PDF link annotation
    • http://ita-bio.space/15153689488gfioe.pdfIn PDF document text
    • http://lianhua.life/70841419427dpwsv.pdfIn PDF document text
    • https://matatotasewitux.weebly.com/uploads/1/3/1/3/131384286/ebbf95a0.pdfIn PDF document text
    • http://vipadminler.org/42245245122d94uz.pdfIn PDF document text
    • http://cadenalia.com/68652752104bbbqb.pdfIn PDF document text
    • http://gratoram.site/metal_can_be_hammered_into_sheetstnwgv.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/1925390.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/040947.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
    • https://s3.amazonaws.com/gomakobez/bastien_piano_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/41530569045.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/nunezuxusetoluzejaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/jozamorazemekemifuririgag.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/bayside_middle_school_san_mateo_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/chain_png_image.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/73485742936.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/chromalox_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/dirovevutubupiwujodolisew.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/von_der_leyen_political_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/physiology_of_respiratory_system.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_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 4876 bytes
SHA-256: 7f609e02cccb0f26bd9632be62c49277387ffb3f85db6ed9ec29afa730f587da
font_01_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 11004 bytes
SHA-256: 570a18e7769688179657b23f277b5217c46973a849cc01ef597d815e9c4ba3db
font_02_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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