Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde6b4d52eb6dd09…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 04:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a0daf724d99a2fcf6678f0cc993fa50 SHA-1: 47797ddbe0f4db440e836db07b2c476a4882b4c2 SHA-256: cde6b4d52eb6dd09dc03bf578b55372a7a5814181838fb4178655fa377458936
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and a hidden clickable action. It redirects to a link farm, suggesting an attempt to lead the user to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://rsentco.com/upload/file/158886228.pdf In PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/66548702033.pdfIn PDF document text
    • http://elitacasa.it/images/file/12229060221.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/10386735736.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/92883658154.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/wogimutujoro.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/kadupililufuromowijesuku.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/ridisasikapesi.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42988864412.pdfIn PDF document text
    • https://pokereshop.cz/data/file/danapajogefagutakex.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vikeru.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/2824315922.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/49917489586.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/45049445207.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/xuzetatibekutat.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/41238686793.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/7461658730.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109130027301241.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/finonewemudejiga.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/kiterixo.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/gozijaxomibar.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/89063699497.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210901123354.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/38695185678.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/xalexesiwodolizugapikapo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/puwulinanedaw.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wologinakonegipugikebuk.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/951811871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sequence+of+three+nucleotides+in+mrna+that+code+for+an+amino+acidPDF 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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 13676 bytes
SHA-256: 753996a248bb773740c3505b74141ca20f3124829284649856b813aae2f89f17
font_02_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 11060 bytes
SHA-256: bf7d25226c9147325161ba6ddd5605f81ff5cedb2605c74ff7056eb6f970cce8