Malicious PDF — malware analysis report

Static analysis result for SHA-256 5880716bfbb49829…

MALICIOUS

PDF

83.1 KB Created: 2021-03-02 04:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd4ca6682a3c6d5236cb22375ad66a63 SHA-1: 9a3f28de7d66bc9c2e006816229648f11785a804 SHA-256: 5880716bfbb49829265e778ce67e7b26ba318ff58d3ba4c66cd1406e0bea3340
156 Risk Score

Malware Insights

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

The PDF file, disguised as a physics textbook, contains a significant number of external links, a technique often used for SEO manipulation or to distribute further malicious content. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful sites.

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 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://resalured.ru/strik?utm_term=principles+of+physics+halliday+resnick+pdf PDF link annotation
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/zijodewowovigisa.pdfIn PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/48eb921.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/ligore.pdfIn PDF document text
    • https://cdn.sqhk.co/votiwixuduzo/drgehbC/kudisediwexupewifixunukut.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/gjL5Qff/fugizeda.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/Stgchb3/top_speed_formula_ramp_car_stunts_game.pdfIn PDF document text
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/derafatesoloko.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/62011958025.pdfIn PDF document text
    • http://alkim.xyz/8693379663913ayb.pdfIn PDF document text
    • https://nivikaxixigimom.weebly.com/uploads/1/3/5/3/135322477/d795f3ed91.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/nuselufuzo/calibre_svrf_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/ejercicios_numeros_romanos_1_eso.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/definition_of_cosmetics_as_per_eu_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/rattlesnake_point_trail_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/4611590691.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/babua_kahela_rota_hai_bhojpuri_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/believer_imagine_dragons_viola_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/29024862859.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_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 5408 bytes
SHA-256: 4ba1d9d90127197295187c67e7445ad1d85a6c934751c3992ac3400c8b1d40ff
font_01_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 11048 bytes
SHA-256: cd01ae0f69b2bd0d7fcd1a02c734ba41095e09afd0185671037fbe4b6591432c

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