Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf09e557e3273ba7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 11:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc56bb8a805ea4cf4d3940b8e44568fd SHA-1: fcc61e979937e81fb83e981d71aff3d45ef99f36 SHA-256: bf09e557e3273ba7f38a6846799a385b5b8dc5585491ec7add5aa3f3e83f1ec8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=t%C3%BCrkler+geliyor+full+movie+english+subtitles PDF link annotation
    • https://medarbindia.org/ckfinder/userfiles/files/98701816912.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jopejisereguxut.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/vafimileradekiwad.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/73211083447.pdfIn PDF document text
    • http://byecook.com/ckupload/files/13728837899.pdfIn PDF document text
    • https://cristalensi.com/public/File/zekafo.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/gupepoxudi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130927cabcf2---wuwejufun.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363a177ae2d---54586426385.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/81400574200.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/67247698704.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/44955061940.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lawup.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/puvipemilomalev.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenopotutexezeba.pdfIn PDF document text
    • https://derfo.info/resimler/files/vumoxelape.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/11162248965.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/rijulezitazeluvomol.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/90492659947.pdfIn PDF document text
    • http://kezmosas.hu/files/file/54814793413.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizajumux.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210904044920.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/94949883424.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_off0000b718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 16448 bytes
SHA-256: 8d27fefa0c9e3c9114d8b2c9ac97a489ea44ddfa9bf498a1e08ee7a1df2cd866
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 11164 bytes
SHA-256: eee773173c84e0035efdeec57b861bdd32f419e92c7d61d5ee7581568844d9ac