Malicious PDF — malware analysis report

Static analysis result for SHA-256 f220091fa6095c7e…

MALICIOUS

PDF

109.7 KB Created: 2021-09-11 19:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fac4441b7b68425d36a695da4416b2f4 SHA-1: c9d1ba413db3956b97dd885cfa66dda331608ad8 SHA-256: f220091fa6095c7e99cb6d85b0fb49704cf3aa35531793f455c07131b44cde4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of embedded links pointing to distinct, potentially disposable domains, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the detection as a trojan implies an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://enidental.com/userfiles/file/20210908093743.pdf In PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/25869930055.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/botigijalugibiforin.pdfIn PDF document text
    • http://tai-group.com/upload/files/ledupozakifetolotisidib.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zosesaxonuwesufijixu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/19850495122.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/popesefan.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/10319832961.pdfIn PDF document text
    • https://kildevangen.dk/files/10481353172.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/korapotoduzutigurotuwonij.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/88512040194.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/lejatulanig.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090201010273499.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/zafize.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/kagubarezexekoni.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/xesufapanetitavusipo.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/musifuruvipun.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/savaxuwexitutubudikatu.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/rugapikixiwomig.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/zokaru.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/vakuravodumigixe.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318e1ea8847---fitip.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/rejiwinoleferejelifan.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/7673594255.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/xebilataxafilural.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apuleyo+el+asno+de+oro+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 20172 bytes
SHA-256: 23aa2e9241f0d57b205546649e7e9876a4e4faead6115fb6cb6c2a7e9835e1c7
font_01_sfnt_off00017900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17900 10496 bytes
SHA-256: 93187dc91c19a6772dfc2dc87e5cd6cb25ed1cacbb76eae20494118632e03a87
font_02_sfnt_off0001910b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1910B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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