Malicious PDF — malware analysis report

Static analysis result for SHA-256 304106e2b4bc7200…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 13:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d9c6c8814676a362ded3ddc3bfd1b34 SHA-1: 346983ecc67190a4d0b12469f37377b85082d7ff SHA-256: 304106e2b4bc720002cc552a75db69e82386cf70c0ee71414cbd2406e52d536a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.dooleysnaturalgas.com/ckfinder/userfiles/files/59395917309.pdf In PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/50328567183.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/dixojemawawupodagogi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613547b1891da---tovusodejivaduguxipew.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/63449495721.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/73043068461.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/nagefurebip.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/68820722465.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd94a5e7e3---kewabalefukojotojelamure.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/kegusezi.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/fovoped.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9607223817.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/43738764282.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/numubunukiparaxen.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/mepefoka.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/ximedajesovalafusezem.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/46937069978.pdfIn PDF document text
    • http://attlas.center/userfiles/file/forimesasu.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/34121455578.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/91298541174.pdfIn PDF document text
    • http://www.bash.cl/media/file/pujabifotem.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xakix.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/22461090722.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kezabekebujusati.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/91344854247.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/66932032528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+quiz+gamesPDF 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_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10736 bytes
SHA-256: 03fb149fd5b004e197b9d1848737023a84a9de2834a70d933fd8d999c49726d2
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 18176 bytes
SHA-256: f9e44b9f187fdb1e6daa005535757a1703a640bb564b0861159f54cb3232f569
font_02_sfnt_off00013583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1