Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c3ef3f8aa36d71…

MALICIOUS

PDF

117.7 KB Created: 2021-09-13 08:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41708adc75752e53ddf1922541e0d7df SHA-1: fdf58f2c592ba363a443f5fb933b8a1f497c7a6a SHA-256: d1c3ef3f8aa36d71c222e988a0d14401012c309c07ec8a753353b07d0b56e0b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://tradingcall.in/ckfinder/userfiles/files/57271354109.pdf In PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/39422108608.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/jilovibawukotipi.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/xodexokupawexagiluvajobe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/10555cdc2f8c8f832783573cbc63ab93/63061989781.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/diwoxewerujujabex.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631062332bkSm.pdfIn PDF document text
    • http://edeins.com/userfiles/file/wutugebofojodowaxufeza.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8d9162c5205a765a3d722337d55ef0b/juluzimufisani.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mudufirevafoj.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/semizevoxamabalitizono.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/70998029600.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/77527021941.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/teroxibalisisebitadon.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/vogetefedisodivomeduvuke.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/dunabaniba.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/wuzivemoridut.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/33920543805.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/sepasib.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/gejejiwatowi.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/viberetazulal.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/guvale.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-13/20210913060310777764.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/mowebudezimik.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/biragojasika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+zip+gbaPDF 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_off00016ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD2 10476 bytes
SHA-256: a1f8104e249219618040d56d41d1ee4fda3f40e5628888c7c8e577af1dba7fed
font_01_sfnt_off00018261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18261 17936 bytes
SHA-256: 0e1942e5de6a90122c7e9b40e4df39c0bdfbe1fbd352ea056d03918d92858cff
font_02_sfnt_off0001b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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