Malicious PDF — malware analysis report

Static analysis result for SHA-256 e773c79809b88810…

MALICIOUS

PDF

75.5 KB Created: 2021-02-23 23:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 57e04205b98d3a6a43601b57ef8b860a SHA-1: 4825406a2721c47263d1bd2028d3cf36ac120ac9 SHA-256: e773c79809b888101e0470d71b5a2600c3930a3295a349b16086e7ecd9e3623e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=what+sleeping+position+helps+period+cramps PDF link annotation
    • http://life50it.pro/suralanurafenapuxedamudw9kan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fc7a964b6644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fce5ab0d7ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_60184c7720794.pdfIn PDF document text
    • http://clebohets.xyz/985594092578quzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5ffb72c6f3557.pdfIn PDF document text
    • https://dibigisilob.weebly.com/uploads/1/3/1/6/131607467/maruzesebalo_dezarufuxiture_zofesase.pdfIn PDF document text
    • http://all-gopro.com/451077978195iiss.pdfIn PDF document text
    • http://bufanono.iblogger.org/paxasakepalisorani.pdfIn PDF document text
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/9789224.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/mozedijiz/codility_test_questions_and_answers_python.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/67365300130.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/how_to_become_a_better_speaker.pdfIn PDF document text
    • http://wotixebapaxuwug.rf.gd/icloud_photo_sharing_full_resolution.pdfIn PDF document text
    • http://mekidojakad.rf.gd/gonejotafupajiti.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/lofizetuzozud.pdfIn PDF document text
    • http://todubina.epizy.com/45954243384.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/34979993459.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/apocalypse_child_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/807630228.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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 5500 bytes
SHA-256: f5c083defbdf5ab2af62a9ef675f7e78586503474a1ec6f6ab4920c10fdbedc5
font_01_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 10764 bytes
SHA-256: 1fa695ad2d5737a7fdaec172993f236375c4382ecd82d881c3f37a17e0774f99

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