Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9900483b7b866b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-09 19:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08a2c1c493b66af564c0b506bca6d6ae SHA-1: 34d97e24e8e75e52fe58e7724f3a92a5ecdabbb8 SHA-256: 6d9900483b7b866b1befd5e92c4e89b1c4f0456299811de3b13caa5467b3f125
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to trick users into downloading files. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eurolocal.info/sites/default/files/images/file/subipurulupok.pdf In PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/21372649039.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/6762692689.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/kuripimo.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/nururej.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7r4pi50h8jp9iilkpbjd9ssh1p/lumakani.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/8811670285.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/52589442520.pdfIn PDF document text
    • http://tzsunup.com/upload/13184444277.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/58362633937.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/4340549581.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/kinukapegukela.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/xewarusan.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lujoruvokogigetox.pdfIn PDF document text
    • https://beautydent.hu/editor_up/60284971676.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3ff735ea---96590620149.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/75388497821.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/37414362563.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/fodetativovuvas.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2833851355.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/vexafitakofakomusiporu.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/mimigetupazi.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/26520369439.pdfIn PDF document text
    • http://stylekd.ru/files/55137756438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=warhammer+fantasy+6th+edition+rulebook+pdfPDF 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_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 18568 bytes
SHA-256: 07e971bd195d56e229431d51a001e44ef32a2d816bd1cfa2be2c0b9a583eb5c0
font_01_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDB 11372 bytes
SHA-256: 2ef5bcc8a381720f31966bd6e45a0df8af7bcc38e66890edc0818a5cf70abbe8