Malicious PDF — malware analysis report

Static analysis result for SHA-256 9def7d6fa3d84bde…

MALICIOUS

PDF

89.4 KB Created: 2021-03-10 04:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a76d21f81914429a51ac61343eed5641 SHA-1: 5be6dbd072738d72a9ec489b59a44022893d5edd SHA-256: 9def7d6fa3d84bdeadaf58e8fac8c6a7aff70bd5b1f1559262876ac9fdbae2c4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/wix?keyword=a+manual+for+creating+atheist+pdf PDF link annotation
    • https://cdn.sqhk.co/jaxubefe/Hicig9h/bubble_shooter_runner_games_apk_download.pdfIn PDF document text
    • http://skidki-day.site/67788567068qs2ko.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/wesekubesaj.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/hghUrk3/quantitative_business_analysis_course_outline.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/4kjcZou/61237103940.pdfIn PDF document text
    • http://easterthjg.com/496354448564j6cn.pdfIn PDF document text
    • http://bivisurat.22web.org/93261774428.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/ie6jeij/xidiwovemibetujabop.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ZOiih0M/fosuwivejej.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/fd42069929.pdfIn PDF document text
    • http://petrol-v-pol-price.site/enthalpy_of_ch4nmfa7.pdfIn PDF document text
    • http://jisilasi.22web.org/paraxerabe.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/Zk1fji4/list_of_2020_pop_music_songs.pdfIn PDF document text
    • http://mrshadow.net/40209216391j217p.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/cgfhaEp/pallabi_smart_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/5AUhbzR/7091_heron_circle_carlsbad_ca.pdfIn PDF document text
    • http://discout.online/gone_with_the_wind_sequel_full_movieae8gm.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/7024067.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/uOd8zhg/free_music_for_youtube_player_red.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxaroxabim.rf.gd/89955036285.pdfIn PDF document text
    • http://wuvasof.epizy.com/reforma_beira_mar_de_fortaleza.pdfIn PDF document text
    • http://zepogofeto.epizy.com/job_knowledge_performance_appraisal_comments.pdfIn 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_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 5556 bytes
SHA-256: 5d31952bdbc87909ed904ca69fc65ff0d7b03742a43262a585e1449475849d1f
font_01_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 11280 bytes
SHA-256: 5afe3b136b305117230e522b8c436f7fc874fe1a5a245b7682138c656bb1f8b5

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