Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d3ffa29566a83d…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 07:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a23eed7ba801f338c55ba93539c95e SHA-1: 7167dccbe8c2b11752cc54c2d2060e8ac2caf89e SHA-256: 49d3ffa29566a83da03ebca2c3088b27ce1b91dff133f8ce3d379a811096c059
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The file contains numerous external links, many pointing to PDF files hosted on link farm domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/wix?keyword=teaching+subject+verb+agreement+fun+way+ppt
    • https://cdn.sqhk.co/teposodigar/gfgjqji/94649244059.pdf
    • http://usacarins.com/another_brick_in_the_wall_songjaleu.pdf
    • https://cdn.sqhk.co/gabadifofibo/giOKS3y/credit_report_free_lyrics.pdf
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/jititatamenefas-fozozu-dunutigira.pdf
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/6343067.pdf
    • http://padojobimo.mywebcommunity.org/1782651559.pdf
    • http://sovetnik53.ru/introduccion_a_las_relaciones_internacionales34anm.pdf
    • https://cdn.sqhk.co/noloxunipe/Igi2uX5/ocean_warrior_course.pdf
    • https://cdn.sqhk.co/wepurodapike/jhgiDMw/9892198074.pdf
    • http://chtotakoeverti.biz/best_bariatric_surgery_recipeszh72i.pdf
    • https://cdn.sqhk.co/moleselofa/ggVwhb5/68439902060.pdf
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/5551274.pdf
    • https://cdn.sqhk.co/tajaketo/dDhfoeY/stay_alert_stay_alive_south_africa.pdf
    • http://leledup.mypressonline.com/409933989.pdf
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5fd879ebec805.pdf
    • https://cdn.sqhk.co/barugogip/TUqi1hB/ludo_neo_classic_download_uptodown.pdf
    • http://libralab.digital/vivodozokabetobisapaw9xpyw.pdf
    • https://cdn-cms.f-static.net/uploads/4382405/normal_600a02faba1a3.pdf
    • http://vipimuxatomefi.medianewsonline.com/agenda_web_prepositions.pdf
    • http://mevukavotidu.getenjoyment.net/62382953579.pdf
    • https://cdn-cms.f-static.net/uploads/4474205/normal_6037d4098f212.pdf
    • https://cdn-cms.f-static.net/uploads/4479451/normal_601a19112b1ba.pdf
    • https://cdn-cms.f-static.net/uploads/4373998/normal_6043517e0680c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f4.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 2828 bytes
font_01_sfnt_off0000fbee.bin
f63dfe02a92cd2ab8e6365abf7a59f2a7388e8515cb6354232f9a152953ce791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 5816 bytes
font_02_sfnt_off00010fb3.bin
86d18b3968ea3c4f8b1659502742e7edd4911a065cf6b4263ff7682321be2b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 9756 bytes

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