Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a3efbed2415886…

MALICIOUS

PDF

97.6 KB Created: 2021-09-12 22:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6451388163d2554fdf6ad54b1c13cd7 SHA-1: 4381a8d89aa61a033006e97d8ec6ff56ccdbb8ad SHA-256: d5a3efbed241588682fdf79a2a42fb28404e1315d1c5d3337264e52ea71c6560
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm with numerous external URIs pointing to potentially disposable hosting. The document body was unreadable, but the presence of many links suggests an attempt to direct users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://profix.fr/ckfinder/userfiles/files/pijepijuzonanaxapejox.pdf In PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/58761409751.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/sijiwanoreropa.pdfIn PDF document text
    • http://charivne.info/images/file/14454013263.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kipilebiviwobejaw.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/65960574797.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/javuf.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/28565112588.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/10976652664.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/80772521565.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mosutovukorakolute.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/30884269316.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/muzosixakoborokaxonat.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikagoxasogax.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/38679145291.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210910114719_493037156.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/8116913341.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/25166575221.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/44848902959.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/wogekexoku.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tewuragaguzelevijav.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/lapodefixuduvetinodojikuf.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/79226291916.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kesuruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=thor+ragnarok+full+movie+in+telugu+download+in+tamilrockersPDF 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_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 21304 bytes
SHA-256: 3addc51ec4ec0c51c1ebc514a6acfddcb093a9f01b1b354822ad0449f4e17e30
font_01_sfnt_off000143d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE7 11232 bytes
SHA-256: 92059a3a29e9fada8339dd893f1ab55d88225827de2986945b57dc8fb16c5f41