Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8084288d64935c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 00:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12a9f3982b41d0957e73133b6adadb27 SHA-1: ded56804cebe4e8c24abe730789275bcac3e27ad SHA-256: 2b8084288d64935c734091695919162b72bffae78d5132449bb7e93afeb9b051
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laconchigliacasevacanze.it/userfiles/files/51884294060.pdf In PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/dudisafopobefadak.pdfIn PDF document text
    • http://apothepharma.com/upload/files/romuvepusafu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/vejojapesimu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xuzujitawulodozozubetowab.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/86189620004.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423626ced5d---88095910355.pdfIn PDF document text
    • http://seto.cz/uploads/wegevu.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/5368529002.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/64095278622.pdfIn PDF document text
    • http://vanhacollection.com/images/files/94876652608.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d74dc570---29233763934.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/70201290470.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/nekenusapetekosikumalat.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/9258538936.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161328362135c2---fokerelurifofa.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/51059361096.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/tafunililizabekosipe.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/genanupaxanurosow.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/32404731742.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/80501481693.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zajisutibakamupuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=peep+show+putlockerPDF 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_off0000c425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 10392 bytes
SHA-256: 5fa2e61830e90aa1fc5e46950cabb6dadd35699b48101346a14c7fd6a00ee499
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 17228 bytes
SHA-256: 275d36db9298190035cf35b61fe866cfc86af4f9461142e4db0131f9843aea95