Malicious PDF — malware analysis report

Static analysis result for SHA-256 61020de94b644f85…

MALICIOUS

PDF

90.5 KB Created: 2021-04-03 05:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c7dad10decf8cb7beac3ba432434dc1 SHA-1: d307eeef31e6e42b3fc986c19acdb3247843c9d2 SHA-256: 61020de94b644f85e90646f5e32d88c8e86c5f37ab7c9b88dd4ca727585d3f4d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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 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://vilenefex.ru/award?keyword=bioconjugation+chemistry+pdf
    • https://vajunepiw.weebly.com/uploads/1/3/2/6/132681590/2181101.pdf
    • https://static.s123-cdn-static.com/uploads/4484363/normal_600858c7e873e.pdf
    • https://cdn.sqhk.co/tatudawo/ggjjhny/android_screen_recorder_with_audio_github.pdf
    • http://jorowijedo.mywebcommunity.org/numerical_recipes_in_fortran_90_source_code_download.pdf
    • http://xafukuxovikovu.22web.org/html_form_align_center_css.pdf
    • https://bagesasadav.weebly.com/uploads/1/3/4/3/134383367/4632147.pdf
    • http://puvinizozibejir.mygamesonline.org/simopezuxanebesafa.pdf
    • https://cdn.sqhk.co/nexuliwadi/dhe4mib/21633235938.pdf
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/6094209.pdf
    • http://worabipupe.mypressonline.com/andy_weir_the_martian_amazon.pdf
    • http://jawojiwet.22web.org/fate_grand_order_craft_essence_leveling_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4490534/normal_601f7ee78e27a.pdf
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/897928.pdf
    • http://wopedejani.iblogger.org/acids_and_bases_worksheet_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4368999/normal_601951fa33710.pdf
    • http://mavigawika.scienceontheweb.net/70039218914.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://doriponesarom.myartsonline.com/renuvumujutexovav.pdf
    • http://moxixezegosa.onlinewebshop.net/antrag_polizeiliches_fhrungszeugnis.pdf
    • http://kageditivumimor.onlinewebshop.net/arc_length_and_sector_area_quiz.pdf
    • http://bepalekene.rf.gd/54578811111.pdf
    • http://vugurajuv.epizy.com/the_unbearable_lightness_of_being_novel_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124a8.bin
35ad57f00aefd65aa4a0d524cc6044247b389f8b4733c439094aef0472952229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 5764 bytes
font_01_sfnt_off00013836.bin
9c9fde0a29d1b1e8f93212bfbccd7d5b4c2a3070f597559b29c9d536e312aa79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 10828 bytes

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