Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24baa7a0a717eb7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 22:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15f24ad582eaee6dc3bfdadfc9dc3fbb SHA-1: e726c97a1ed95c649f78f082f53eb69d92402b89 SHA-256: a24baa7a0a717eb708d37b48a4ef062ec5c2bade394ad48344597e6773756d5d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sbsedupatti.com/sbsedupatti/userfiles/file/zenutevoxadutimoke.pdf In PDF document text
    • http://parentini.it/userfiles/files/89807820099.pdfIn PDF document text
    • https://socardan.com/userfiles/files/muxogesudazizotatujazuji.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/fixumufogerumipidike.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/7372303282.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/23c8af022c2e181e7e8c9f1ac01c1c5b.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/jexevutesubutin.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/54656192361.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/28878761538.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/36302577474.pdfIn PDF document text
    • http://4bx.pl/public/file/90411732098.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/filavi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/16968531153.pdfIn PDF document text
    • http://sial.pl/galeria/file/bejusizuxiwapexoluxonome.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/34460585731.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a3832781b---59855231729.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/litawuteverivilona.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n2umfsb3gctisdkpg507kpvi64/wexaguxarun.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907003143.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/timimuroxe.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/linijazok.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/powazoridetegem.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sixaro.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/71713894030.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/vetipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=taichi+panda+mod+apkPDF 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_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 10288 bytes
SHA-256: a946aeeed465bc9e9284b206e668d3421ef0266916dd9d37e641dc134ccbbb08
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 18340 bytes
SHA-256: 2d5e80841d307e46422a2fc3949eb2069c520018be4d176afc151dad203167ea
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1