Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ea09a52f8ed89e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 21:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 21c574dc9aa1422c830bf9d200b0b64c SHA-1: 35145410fcaca20364ad8370f406d0e439b3c1ae SHA-256: d4ea09a52f8ed89e9eecd9247b162cad6d6b58acbf5d042bcf05331de1fb6947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 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://coretry.ru/uplcv?utm_term=connect+android+phone+to+pc+using+usb PDF link annotation
    • http://studiolegalebisantis.it/userfiles/files/mabumonutejenakame.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/geravovolabobejo.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/wajafod.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/1465275883.pdfIn PDF document text
    • http://sswjeans.com/files/bitijifimajamepodesaxi.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/webebapejitizi.pdfIn PDF document text
    • https://ccvt.vinaonegroup.net/upload/files/sexom.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/35429725072.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/25243703620.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/21938806730.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/nuvufazepukugatupe.pdfIn PDF document text
    • http://vit-physio.de/file/paxetebugewoxitigiziki.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/dozavowazikiwatete.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/17791192338.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/h1ugp1d7oib4r3nhoasqc7murv/lodewonojuzapaf.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/juresezozarov.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/najuxuko.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/10522255226155e03664d0d.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/41704334647.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/95189440323.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/jumezufejodetol.pdfIn PDF document text
    • http://cssh.es/img/file/neginubevivetuxosiv.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://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_off0000acb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB5 15780 bytes
SHA-256: c9dd1538eedf2f5bbc4d8143a34757792aa0a7b8c401f88cd111967ff2a8434c
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 11020 bytes
SHA-256: 7b99314d557e9485740310c564136e0fb770d6556133ff6c6925bed7ac7f2d23
font_02_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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