Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1e4375a1819617…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 10:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51b8428940ed1de7818392d0816f2707 SHA-1: 249ef1cada3357e86100635171be1e69eca282f8 SHA-256: fc1e4375a1819617faacee9f0f4f7127de3ed6b5d3313588d719573b1e6a238c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is http://pkynfe.net/userfiles/file/xakipepazepixuvinofikidor.pdf. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://pkynfe.net/userfiles/file/xakipepazepixuvinofikidor.pdf In PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/buwolabad.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/8666744707.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/roxonopabobigajigewefefuw.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/43578212370.pdfIn PDF document text
    • http://cabini.it/userfiles/files/mosige.pdfIn PDF document text
    • http://idcla.net/upload/files/85413456105.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/lukiverovoxuwemumagukum.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149535e35987---22393712670.pdfIn PDF document text
    • https://terracell.pt/images/file/savaravo.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/bepelotiromebufedijevetu.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092604224373499.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/7691405076131aa98cda19.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/70743603888.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/77744378443.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/27010916686.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907145809.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/dazifasirevafoliki.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/71365618404.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210921094538.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/88492661190.pdfIn PDF document text
    • http://8njl.com/userfiles/files/noranibojomok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=alice+in+wonderland+read+onlinePDF 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_off0000ad54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD54 10164 bytes
SHA-256: ce467055a7cd2579fe5fc6640fd343b1f30048ddd5c2fbd02aa9204bbceebb0a
font_01_sfnt_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 15040 bytes
SHA-256: 47fe293ffb77049bfdefbb40e47ed6a1748524986409ee0d5dc0c1ec3b2f94fa

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