Malicious PDF — malware analysis report

Static analysis result for SHA-256 7890a79bdad16c09…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 14:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29a99da599e246bda56f8c2154c183fc SHA-1: b4e91aa044ce7cb7b433c3341bfff3697ad6e756 SHA-256: 7890a79bdad16c09f048a112f2445fdbab715c07a28c8bacf39833ebe5cdd8ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avalon-essenzen.at/userfiles/file/lokopoziropubibu.pdf In PDF document text
    • https://parfumzone.ro/files/file/molefijimode.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/15102355821.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/27402431964.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/26055423379.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/mobomuvobinikuv.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/90026910561.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/15449502877.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tudurujo.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/8465181415.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/5124248588.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/nimixuwetumuvekomo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/1287970549.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/sedazuwuloxime.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/goxejugele.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n7el14r0jajdillmb2mo1s8d01/82366969881.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/fijokuk.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cb35fbe32475fee099e67a0d3a3dfddd/wososufileziwipejojobogot.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/jofelu.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/zodewiputaziv.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/lumewikevatagi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/82150380263.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/zefere.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/piluratetegunaduleze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gretel+and+hansel+torrentPDF 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_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 10292 bytes
SHA-256: 2927eaf6ae1b74d5f3b0f1369c72a1358996f92a6899ce3446ca3be719cad22b
font_02_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 17764 bytes
SHA-256: c43c6c7669005b157aec23f25ecbb3821cef5a2f28814dec5cdffd8521d41ece