Malicious PDF — malware analysis report

Static analysis result for SHA-256 6395956268ccd951…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 16:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e4dae31d8fe06cfef94a1183bd5413da SHA-1: abedb331e26856b743c2978758d9c8afa11f832f SHA-256: 6395956268ccd951c932c8017158893eb665e0caa02d5d8e0bd41122c60e4060
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/award?keyword=cancer+cell+journal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6032c5410e801.pdfIn PDF document text
    • http://penerete.66ghz.com/avira_antivirus_free_trial_version.pdfIn PDF document text
    • http://mebosopevux.iblogger.org/call_of_duty_ww2_beta_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ffef11e5e7ad.pdfIn PDF document text
    • http://susadaxaxavotij.22web.org/books_like_star_wars_lost_stars.pdfIn PDF document text
    • http://canonsburglake.org/power_pressure_cooker_xl_cooking_ribsiak7l.pdfIn PDF document text
    • http://rubeatyshop.xyz/wizebuxilemetewosume9m146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_5fce2828eaad5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_60007d626b0a8.pdfIn PDF document text
    • http://fruit-citrus.space/discografia_de_conjunto_primaveraju07k.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/rekorewexidiwo/sweet_corn_production_guide_in_the_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/pitch_class_set_calculator.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_f2a283dab2bb4ed3b0ff3dc33a8a8885.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/60256289686.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_d546f46074014436ad762394550f766c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/bitizuresoworijuja.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/vonenabazobita.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_84fd90143acd41aeab3d79797373774d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/velinolaf.pdfIn PDF document text
    • http://jabepujun.epizy.com/batching_plant.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_df41552b232b4cd1a2269de6afc6c49d.pdf?index=trueIn PDF document text
    • http://tegiledo.epizy.com/convert_between_units_of_time_worksheets.pdfIn PDF document text
    • http://tobekiginekafo.epizy.com/90926670322.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_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 4952 bytes
SHA-256: c1ce78ae5a4185cb6caa63ca574e24ea540f40cd03cb461f28bde295c6f98321
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 10920 bytes
SHA-256: a10bb486f592a3aaf1d6aa92d724037dabfd1061ad218ed560ae70151c871626

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