Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d94cb821349583…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 847dcfb681247974c013eee0428a0792 SHA-1: ad1ed01c74ca6251b53cee6822da077b7e566010 SHA-256: b6d94cb8213495839229b2dcb0e5778ce60e8a8734a3d37cf3115724a510dfb3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one identified as a random, algorithmically-generated URL hosted on potentially disposable infrastructure. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. The PDF structure and numerous links suggest it acts as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=deepl+translate+web+page PDF link annotation
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/niwopevexulajigidevoj.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vodewarotaximefaji.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/54088345648.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/regawa.pdfIn PDF document text
    • http://timocomputer.cz/files/file/bovasowiloko.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/38344248320.pdfIn PDF document text
    • http://rurisnet.org/images/file/kaboxu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/71897018646.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/18610047060.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mizakas.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109170719304809.pdfIn PDF document text
    • http://bndweb.nl/upload/files/diromaju.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/jadusetenezamiren.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/mebudabupegenofebobilane.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/vobejozekemomoxurirajuze.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/fubawogupop.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fenenolimabojevivog.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/pojumemejokezusugakoxenos.pdfIn PDF document text
    • http://status.cz/UserFiles/File/94560508636.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/tazazugusidusir.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/75985417300.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/zoxumixemosozofuguvuliru.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/54846851913.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimejelisipazijuvegix.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_off0000beec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEC 16800 bytes
SHA-256: 54e05adbcf3d9ce4954385ac2cbf545783523cfc5310f5f362c1cdbe8da1ab16
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 10444 bytes
SHA-256: ababe0bea682493dc7dbe5d6336ad6472e30fe3e3691a0c400061807c81e51cb