Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8855008a49fddb7…

MALICIOUS

PDF

92.2 KB Created: 2021-02-17 06:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b8aed57bf2d02c9487300960a392becb SHA-1: 4a1a9d67eb7b9e72777c96909f0f7fed654e48b9 SHA-256: f8855008a49fddb786583cb6a18829ccb88df6e73cd200d9102193e0e825ae89
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure, and ClamAV detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6176

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=hanuman+chalisa+kannada+dj+song In PDF document text
    • http://pupofikavize.iblogger.org/somolusekiwiparix.pdfIn PDF document text
    • https://cdn.sqhk.co/rirakibugo/jjFgijb/ringworm_rash_baby_treatment.pdfIn PDF document text
    • http://kefisel.22web.org/tasemawo.pdfIn PDF document text
    • https://manasuxejorodi.weebly.com/uploads/1/3/1/6/131606962/9477110.pdfIn PDF document text
    • https://cdn.sqhk.co/poluxofad/iahjcvy/paper_racing_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/bjfsha1/snappy_tomato_pizza_erlanger_ky_41018.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/ghCefB5/magic_cleaner_for_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/RjggfYD/fruit_splash_2_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/fhjidQR/bafedom.pdfIn PDF document text
    • https://cdn.sqhk.co/zopinulepa/jfl7lhj/tip_top_health_shoppe.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/UONloxA/grand_battleland_royale_3d_massive_war_land_battle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwulifinuneti.epizy.com/funozipif.pdfIn PDF document text
    • http://nadiripu.epizy.com/2019_calendar_monthly_excel_template.pdfIn PDF document text
    • http://guxajez.rf.gd/wekozabibotapuridexa.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/java_8_free_for_windows_7.pdfIn PDF document text
    • http://seviboki.rf.gd/bewaniloforisapet.pdfIn PDF document text
    • http://besigaku.epizy.com/runajabawaz.pdfIn PDF document text
    • http://badokelo.rf.gd/work_history_letter_template.pdfIn 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_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 5360 bytes
SHA-256: 37c3bbc8c93054f1bab6e78a8c1bc05b971a304a0899f31e5630f2a6882b42ef
font_01_sfnt_off0001485c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485C 10756 bytes
SHA-256: a78e8e69be881b10d1ad6132427b75c4631dcd01c79cdbd58fff725175f2e4c3

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