Malicious PDF — malware analysis report

Static analysis result for SHA-256 277d271f50ad9d64…

MALICIOUS

PDF

73.7 KB Created: 2021-03-10 18:23:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f7978ab08abd13e141a8da7aee4d922d SHA-1: 3fc3299fa346ff7fc08535269a4010394c5e013f SHA-256: 277d271f50ad9d644f17a526c8d772d2f041f22cce68c3d0f2c304b359ad27f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be metadata related to PDF creation, which is likely a lure to disguise the malicious intent of directing users to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/award?keyword=pdf+file+merger+free+online PDF link annotation
    • http://uspeh.icu/887404289317q2kv.pdfIn PDF document text
    • http://1xbet-registrat.site/who_is_himawari_uzumaki_boyfriend0hw9j.pdfIn PDF document text
    • https://rivepolimuf.weebly.com/uploads/1/3/0/8/130813401/neweba-niziminatolazu.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/b16bc2bd63c6d.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/UdqVtFl/39743066662.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/dhdEULn/hubsan_h122d_x4_storm_racing_drone_rtf.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/j91ia6P/planbookedu_lesson_planner_template.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/kawasofufikuxapi.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/1302777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_60026c2c53a4c.pdfIn PDF document text
    • http://klossheff.xyz/android_translate_animation_using_objectanimatorqz8v3.pdfIn PDF document text
    • http://bionatur.space/35529308723tvhgd.pdfIn PDF document text
    • http://kersita.fun/tisirivagonavokolosotaxwfm7o.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/hearts_of_iron_4_guidehil3x.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/4618195.pdfIn PDF document text
    • http://prizinsta365.online/what_to_read_after_percy_jackson_series8q6sz.pdfIn PDF document text
    • http://sentytld.online/fuvojabopudowupulidifdh7u.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/b7zjdhb/53609384797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_6012b8ad0b585.pdfIn PDF document text
    • http://topmassage.net/20185092554by08d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 4840 bytes
SHA-256: 6c5b087477ed2ee406378a59bd20b47c8fad84fe45419bf2316e72ad1871592d
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10044 bytes
SHA-256: 924245ed7f4b2771a29e7bdd677fde210ec1ddf9f5d26a04706b42045a2b0672

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