Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a978d929fd62e7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 22:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f0231374484d325035b228829d94f79 SHA-1: dc257f27ed2adfa4042dd5edc8340955f3abfd32 SHA-256: e4a978d929fd62e7c333f467980b921b9b9915304696396548d7e9f6fc03a5f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myappartement.de/web/editor/files/34000146684.pdf In PDF document text
    • http://avvocato-callegaro.it/public/file/zapuzujapuzafov.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/53746116801.pdfIn PDF document text
    • http://castel.lu/userfiles/files/16262182888.pdfIn PDF document text
    • https://eternalbliss.net/file/notevosomatosizilizodu.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/zudifufijedubibefifamu.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/vezisimimufefojog.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161367bc14b4d3---warixaleje.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/dutoxuzekedoz.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/88647129569.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/rixomafanosib.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/guxenegigakupig.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a355eacc4---vipawezigonekoramaliz.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/voboberanefosutomegu.pdfIn PDF document text
    • http://awards.nl/img/cms/file/moxuxerevelilesazivof.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/dudoxanafoveb.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/16839411887.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/22756964293.pdfIn PDF document text
    • http://thecuriosityshot.com/gekuxozexuxapirekupu.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/96460385571.pdfIn PDF document text
    • http://wmsone.com/eimages/file/40164596983.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/bitezigudafidaruxuxeroro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mega+ramp+car+jumping+apkPDF link annotation
    • https://mediaget.com/userfiles/files/bosemitepoladobafuxugep.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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 10600 bytes
SHA-256: c083d68107f9c8d2a52d8599d298ccfed7d1e37fb07e7ce44a9f99d5da923337
font_01_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 18764 bytes
SHA-256: a40a015580affa70e957acc685b49a726fa191f0154faa84e66b2edcde24f215
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1