Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aa1d00f514f566…

MALICIOUS

PDF

73.3 KB Created: 2021-03-17 22:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 612e7e2580c58db31a91263d149a7b9e SHA-1: 3fcc665157a0c8717c73de34f666b501c181d53a SHA-256: 25aa1d00f514f566922653f8cb4cebbd24f0c532abcc56903e1bae053d910ccb
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs points to a page with keywords related to educational worksheets, likely a lure. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=converting+fractions+decimals+and+percents+worksheets+grade+6 PDF link annotation
    • https://sidasunepur.weebly.com/uploads/1/3/6/0/136088000/0dd4725bb4.pdfIn PDF document text
    • http://usecabinets.xyz/20859224824k3aby.pdfIn PDF document text
    • https://nafezukame.weebly.com/uploads/1/3/2/3/132302716/5045086.pdfIn PDF document text
    • http://gevejune.iblogger.org/history_of_western_philosophy_terjemahan_bahasa_indonesia.pdfIn PDF document text
    • http://hayatevesigar.online/surah_rahman_mp3_in_urduoyuao.pdfIn PDF document text
    • https://nakebakij.weebly.com/uploads/1/3/5/3/135339599/lijiziwefedix.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/7616218.pdfIn PDF document text
    • http://it50life.pro/how_to_calculate_points_on_ww_appb9nmz.pdfIn PDF document text
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/7c75b7e15ec9e52.pdfIn PDF document text
    • http://streichpack.online/2758940593w131w.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/nalewerew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_a3172b02a8464dd7aa39ce1f32364ab3.pdf?index=trueIn PDF document text
    • http://pezomovororiz.rf.gd/dulitodaturabajetunamutu.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_49b204a58a7142eeb885d078555f9d9d.pdf?index=trueIn PDF document text
    • http://faxogego.epizy.com/how_to_set_up_my_own_cloud_storage.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_9fc82226116543e6a08bd8d3fb91a334.pdf?index=trueIn PDF document text
    • http://kusefiselarezex.epizy.com/aplikasi_belajar_bahasa_korea_gratis.pdfIn PDF document text
    • http://jukopiwiguf.rf.gd/american_revolution_battles_worksheet_answers.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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5844 bytes
SHA-256: 2c085ad1e8ca146fbe8c2562f27917c4ec4475a1ceefbd9ec99dfe1ddaff3911
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 11212 bytes
SHA-256: e7f0163dc2d33a7a5459c67eafd1fe19374e6e4437c4dfa887f4aafe07507be0

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