Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa496fa7e8409d12…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 21:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d101f29bdbd8b848139b73a7160a2169 SHA-1: c4053fe9ddc0580369cf21059f94a7909ecb65ee SHA-256: fa496fa7e8409d1200bd85c6e5748f0ca75130480fad4930281266f695cf1fe1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to external PDF files hosted on different domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the links are intended for malicious purposes like phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vaness-sens.fr/ckfinder/userfiles/files/95460701004.pdf In PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/veroxerijopovegagofefibak.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/32528459121.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/10705366184.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/neduxorigevodofewis.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/foxorudiboziwabu.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/kukon.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/55059930018.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/xenuxanuzajoxif.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/15270301291.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/potelepabamazuz.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_DC0280530A806C5B.pdfIn PDF document text
    • http://keyday.ru/files/files/siduvatadiragawowev.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/rogubi.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914090943_141057004.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/8492688752.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/kosudabapugazevezudagutod.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2c36ac100e395c69ea0f15cdf46a09b7/19258942716.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120323395071.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/9408514863.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/gamalubokofajatitaso.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/jarup.pdfIn PDF document text
    • http://czyxchem.com/upload/files/wetuloximelogepavitidi.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210905_141647.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/rixajawugapalafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+disable+data+saver+androidPDF 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 17980 bytes
SHA-256: c60e92660e5cccc7979a5836cec55052c41b260799c4e71c4b2ee2b32e87a3a4
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 10524 bytes
SHA-256: 65a5d7060784e2936d14987524718f12b0d98aa52f223c8459550be20ba54776