Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa269bc75cf19f4d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 17:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d78771a2b549ca1db829a882cccf5da SHA-1: ed8b77b88ecf954069713b9ad8a4325023c4c384 SHA-256: fa269bc75cf19f4d87bcef4dad83f7edd9f0cd61b72366b6ce62cadd7b9fb784
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a focus on redirectors. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://uteambio.com/upload/files/23466075053.pdf In PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/nawelinit.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/99911927065.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wiledexakevo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139e981a2fdb---xugarigiberi.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pimositolijavu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614560e98289a---gapuwiwanexoxenukozef.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/18924215821.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/88507922358.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/ganodu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///60508054910.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/82441850910.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/90973817184.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dagegapaper.pdfIn PDF document text
    • http://gojjang.com/uploads/files/99518448152.pdfIn PDF document text
    • http://delifarm.com/images/file/xebuwuki.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/15826196913.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/74219639408.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/84362522384.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/45001215615.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/vevaditemivufi.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/35810817992.pdfIn PDF document text
    • https://airbays.com/userfiles/file/valesejome.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/sanubigagofilekugeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=warden+camp+green+lakePDF 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_off0000aed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 10464 bytes
SHA-256: 4448f759964676c8f99b0a22818a241b32c6370faea944b9cd9b390c5314b673
font_01_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 14860 bytes
SHA-256: 306d05a67faf34b899bae43f3132b1f8fefe9b33d23a3e651de268352c940f22