Malicious PDF — malware analysis report

Static analysis result for SHA-256 f384b0fd31a8c7a1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 13:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25df25532e4679c6a6a82cc31b77f78c SHA-1: 963efa7990e6d4674e1fe03faa72f7f2d0dc979a SHA-256: f384b0fd31a8c7a165ef5fa2857390c48080b38c3c879ce78a6f96d8f95f17c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect the user to malicious sites.

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://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/49809511654.pdf In PDF document text
    • http://ibrahimalsada.com/pics/file/1311854182.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/kamof.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/13538602834.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fetuwuviregumeduruxa.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xujuxixeralamazenulosowi.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/digojafesafusixi.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/suvawaneduse.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/nifepovunoluraj.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/lamamilit.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/52655021951.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bd5e8607---77408423001.pdfIn PDF document text
    • http://wirheiraten.de/images/file/mutagimobovuwu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/pujulaguruxopid.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/pamuwaganege.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/migerelefalozudefiripoxob.pdfIn PDF document text
    • http://arsvet.ru/img/upload/12566089006.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sifituzekitamedidodijol.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/dumozosedopizoribemabig.pdfIn PDF document text
    • http://identik.hu/editor_up/77549540401.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/motuwumobamokisejiwiwego.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf0797a63---58428080300.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/xuvej.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/seperaxufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+red+721+randomizerPDF 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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 21396 bytes
SHA-256: 771dc769a90f9c9a677fae9468db7222f812c77dac1d4c24cadc6cd0debab2a2
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 10472 bytes
SHA-256: 9100485bc0323c2814c131a9ea4b6655c1662116ce6615658d492ef3b8921cfa
font_02_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1