Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e16816cc93fb8e1…

MALICIOUS

PDF

75.6 KB Created: 2021-05-08 23:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0f3f95a138552fc996fb50d333650c2 SHA-1: 76afc42c88fd702e5efad174ad4ceff84925b4e8 SHA-256: 0e16816cc93fb8e1f47f66c6680618fff675ce861740f2b097c04f520b8ac124
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 of which point to executable files disguised as PDFs, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, suggesting the document is designed to host a link farm for SEO poisoning or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+would+you+describe+a+forest+at+night
    • http://sesizuxewewax.mygamesonline.org/pdf_splitter._exe_download.pdf
    • http://dotenipago.medianewsonline.com/40730928448.pdf
    • http://kivolugog.mypressonline.com/metric_screw_thread_chart.pdf
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/sowupo.pdf
    • http://nageramuvepom.mywebcommunity.org/hernia_inguinal_journal.pdf
    • http://lixodamevurobar.mygamesonline.org/60285660525.pdf
    • https://cdn.sqhk.co/duzoxibuf/bFjaMSH/76445481016.pdf
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/dexenus.pdf
    • https://cdn.sqhk.co/jasamomedam/Q2zicMy/go_karts_houston_near_me.pdf
    • https://cdn.sqhk.co/sijaxovada/Ahah4hj/bedingte_formatierung_excel_auf_andere_zellen_bertragen.pdf
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdf
    • http://zijixiteluwek.scienceontheweb.net/medication_administration_procedure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudowo/88026271414.pdf
    • http://fedonefekipide.myartsonline.com/alimentao_saudavel_para_ces.pdf
    • http://lavapokapajemob.myartsonline.com/mifibubowo.pdf
    • https://s3.amazonaws.com/vexosafugunu/how_to_reset_foxtel_powerline_adapter.pdf
    • https://s3.amazonaws.com/gotenukevepunin/59892486508.pdf
    • http://sisufovofow.atwebpages.com/93742355191.pdf
    • http://vamavaremimot.atwebpages.com/archaic_words_dictionary.pdf
    • https://s3.amazonaws.com/supefujoxopubu/management_reporter_ax_2012_user_access.pdf
    • https://s3.amazonaws.com/tojabixefova/bevizam.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_off0000e773.bin
867267401ebbffa4d50c77ad0fe8b3f97214f3fe2932a958dad374dcb27c6044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 5580 bytes
font_01_sfnt_off0000fa7c.bin
6ca5fc30231c05c3f3232095748f51eeac8b770795415a46a63ee936ee324f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 11576 bytes

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