Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d5ad89fd05ff70…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 19:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 349a461613659655f0c3e1770fc9fae7 SHA-1: 38ef69ecdbc4abb4c2ac22dc2d3ec8b913788c99 SHA-256: 68d5ad89fd05ff70e0dfb3002efacd774ecb10c0b87030b7a1108baf416ca23e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tierlistei.ch/downloads/gejezaxefipogugu.pdf In PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/38169777412.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/6300098133.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/guvidikax.pdfIn PDF document text
    • https://norservis.cz/files/files/gotekefop.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/24496620651.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/16338192774.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/98170150749.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/29666812144.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/97823385855.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/9342070567.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/96621242879.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9225736199.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nufununolixenez.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/wifizuwixititoxame.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/13893883318.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210908124643584.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/24520886400.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gafudotozavew.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sikavewoxenapurerax.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/debovosun.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/dimefapenafife.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/xoneturifupofukonupisi.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/xofudajikifolepopot.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/41325105488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=livro+cantico+dos+canticos+pdfPDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 18568 bytes
SHA-256: 15276c13f6a9d4d6b76d58db15a3e973b234a05c317bc7d26c957fe15e1e9a01
font_01_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 10456 bytes
SHA-256: 7f8abd7cc840557b300e9545c20a9fe1d945d532246e2b5360013b1e9eb55728