Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed4e726e0bec4b1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 18:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af30dfb587a11a10b547b2501761e358 SHA-1: 5546558f9a740d1aa2cb581348170e4069e5a214 SHA-256: 4ed4e726e0bec4b16134a968ceddc7c7353fa149019a353f836b477fea76216c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, with a high concentration of links on disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://simoncaulkin.com/images/102620440.pdf In PDF document text
    • http://petra-koparki.pl/Upload/file/xujuxivusolep.pdfIn PDF document text
    • http://intersonik.eu/upload/files/kaserexi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/dotidegonowafufi.pdfIn PDF document text
    • http://fruitvita.com/files/files/zukexolupitajudul.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/popikugo.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dijabow.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149bcecc59eb---padugifuge.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/wagufoxik.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/40615125253.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/35034643319.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/19706365716.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/konosawuxapoj.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/dukedeja.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mogewilu.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/59008726541.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/mijamomozikevukolefoxorum.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/25670006967.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/ruwasifikojogamamo.pdfIn PDF document text
    • https://pecintajp.com/contents/files/82917131781.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/nofofidomer.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/guwereralelepop.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/32422469729.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/lukemixovopawewexoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=monkey+island+2+special+edition+androidPDF 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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 10828 bytes
SHA-256: 3dc2a648e90ab49dad4e27eda8b2080df25a8eec66364cd9a60de8a740e7236e
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 18592 bytes
SHA-256: d7a5a491ad274a438d21b381e6a8eba4d9de3e6876e71642d63bc93a105fcc7b
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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