Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c260ae7f68533b3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 15:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f961090b0ecb99772c1c3fe8a74124c0 SHA-1: c6307ff39f678784156130a20fa6aa3b048057d7 SHA-256: 1c260ae7f68533b3b40aed3adc302d517f4a0633403d342dc945d6fd87004f75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

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 https://coretry.ru/uplcv?utm_term=editor+music+apk PDF link annotation
    • https://phatgiaolongan.com/upload/ckupload/files/jimimewudave.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/bikakaworikumodefedew.pdfIn PDF document text
    • https://alariel.be/userfiles/file/28402310801.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/pikudegojerotelifidasalo.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/53655909484.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/nezovabegiwomovoxevukuruk.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614256efb2276---kevivugiviguboberateka.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/37990192046.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/36745454403.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/51647106653.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gogapetadop.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/ferebaj.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/dugejap.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/26184758606.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/18809000112.pdfIn PDF document text
    • https://huanghecables.com/d/files/bixinebofawed.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/36448084217.pdfIn PDF document text
    • https://kimcert.org/E/file/42484140728.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/86246893176.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/gevuzalovopuvevi.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/bokatawakalitu.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/54023953429.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/jibafijutaritobag.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/65106782225.pdfIn PDF document text
    • https://norservis.cz/files/files/81504164959.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/5274963816.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_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 10568 bytes
SHA-256: 916577c58167b667ef2c6a8a3c7fa0cc3db4f9d9333f57e46453eea8a6650361
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 19760 bytes
SHA-256: 14e8a12f128bf9e07a9643ed22a178276cb3678bd10a93f5405f0b216c36c13b
font_02_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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