Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8569ca1bae6256c…

MALICIOUS

PDF

94.8 KB Created: 2021-09-18 19:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7812b75ad920f5efda0222682dc8a6e1 SHA-1: da9e0c620391601f87bc93ad196e960a6f71103a SHA-256: e8569ca1bae6256c72552b5d72b81d2b398e55411e00100bb444533db626cd7e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

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://queure.ru/uplcv?utm_term=all+through+the+house+full+movie PDF link annotation
    • https://saleskerala.com/ckfinder/userfiles/files/37708577714.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/41090758186.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/beviguwerenuva.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sikivaviziguvumokofi.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/52881627191.pdfIn PDF document text
    • http://muszempilla.com/files/file/26509072704.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/92856360671.pdfIn PDF document text
    • http://remobudostol.pl/pliki/mufakuz.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/zorobuxedirakinef.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/10352411406.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/16261029649.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/sovewem.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/84743545975.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/segumokaderumigewipexami.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/11495425920.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/lubekiforovodinovazise.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/47822559933.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/nubewixebe.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/zijozuvam.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff62b70ba---54704136447.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/sumuwanuramibasaruxune.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/didemeziwixivanawak.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pivisez.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/sofitir.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/75840008966.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_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 17328 bytes
SHA-256: d4ebf8036b8a57a2e994b5608fbe8e7ff2d2b350149e3b0c7f3e34f2b2a32af9
font_01_sfnt_off00013ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F7 10544 bytes
SHA-256: f63892f6a526316304a306681c777c9ad8a65eb6088151d6fcbf969943099488