Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c0ca60b2dde538…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 09:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a505eb3b421714e115e282920dfbce92 SHA-1: baca4870b40b13eae1546fc18b2834ee4ae1679c SHA-256: 92c0ca60b2dde538d92f3e41404a0d7ff967add08c81446432beab57b2d7ad85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing operation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8270

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/award?keyword=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+pdf+sang+%25E1%25BA%25A3nh+online
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/jetul.pdf
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/7033924.pdf
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6018a0cbb3c5a.pdf
    • http://usacreditmonitoring.info/pumadijapukixo61dx.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/rifepuj.pdf
    • https://cdn.sqhk.co/pozigafo/gJhjgdk/61273973487.pdf
    • https://cdn.sqhk.co/wimiwupo/hjbAidc/argentina_world_cup_2014_group_stage.pdf
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/716358d33f1eeb.pdf
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/de4d8ca0.pdf
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/9536722.pdf
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/78bba2b2.pdf
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ff0bc4b195d7.pdf
    • https://cdn-cms.f-static.net/uploads/4492246/normal_60175c8fa4140.pdf
    • https://cdn.sqhk.co/tamenotu/SgjxtQS/copper_mountain_weather_report_10_day.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/bidadevuxapisifo.pdf
    • https://cdn.sqhk.co/gedofovel/gMjibLF/apple_translate_app_ios_14_download.pdf
    • https://cdn-cms.f-static.net/uploads/4392651/normal_60586a23efe02.pdf
    • https://cdn.sqhk.co/wujakegu/Iiaigij/tutawujavotad.pdf
    • http://cosmostil.top/fce_exams_with_answers_2016z90bf.pdf
    • https://static.s123-cdn-static.com/uploads/4476140/normal_60031da754b57.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xukirizugukugi/cape_town_convention_idera_form.pdf
    • https://s3.amazonaws.com/mamibis/autocad_electrical_2014_tutorial.pdf
    • https://s3.amazonaws.com/jofunozuzof/90912036499.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/likenotufude.pdf
    • https://s3.amazonaws.com/wolina/13853923780.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin
725f19b6866077debe00044ee678494bf15ac41192732351dc9cd63796577517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 6044 bytes
font_01_sfnt_off0000feac.bin
1d2a4e63dd979374f18c56b0851a889703b802aad61dbace1636646883bb63aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 17004 bytes

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