Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85bbecb10a54dd0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 17:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0758a697f383f465f7fc62e53ed7c420 SHA-1: c5bc9d708bd70d2748c86b8c6ddb79a9132decfc SHA-256: f85bbecb10a54dd03e1605b39608edd59cca1b066444a73340e939ccda02bcce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=mindjet+for+android PDF link annotation
    • https://ciiinnovationsummit.com/ci/userfiles/files/11384445420.pdfIn PDF document text
    • http://honghuibio.com/d/files/34101083107.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/5179564237.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jukajon.pdfIn PDF document text
    • http://congluc.com/upload/files/63936340352.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/wiviwasubaraxevuwuxi.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/vepafomijebabapejofukunof.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/wevexubajawuwikor.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090520505173499.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/babipagemebixotab.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/83960314407.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/mefizaxebunev.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dutigaxoxoz.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/38657888131.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/24064010970.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/33923966818.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/79818550343.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/85259733737.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/30783495561.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j573hhild3vb3uc9bftrk8emq2/wifelidatuwevogogon.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/75543715807.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/43140792646.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ok3b6a32ehf66avnv47353snu4/vebusuvonodeponojuwamo.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/kerelolurimulasidofute.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_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 17756 bytes
SHA-256: 5ae7dc82f3a6daf239facde57a0a97ef539901b2ebb042426592b8c3179d72cf
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 10256 bytes
SHA-256: 851a75a6bba157069934a3811a3c733c908856553d9a67959c91e45081308c2a
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1