Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef67985b1821388a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-11 21:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d599dfe891c56ab1dcbd15d49a5f053e SHA-1: 323aee05202790fe0443a5b6a99b86633f117b20 SHA-256: ef67985b1821388a65f8fa7894494c7c666f5fa45ebc2504c6e32e1b19d47f4a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, containing multiple external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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 https://crysiq.ru/uplcv?utm_term=can+i+use+my+hotspot+for+my+firestick PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/bedoparazozanivozaw.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/wudoborunuw.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/82509719977.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210904_115154.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/83917761010.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/21123186944.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lujoruvokogigetox.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/piruboja.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/lawutadikezes.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/9617306696.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/zotegilawavirenigixun.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/toladorikamurepiwizaxula.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/sixikagijoxutizovaxas.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/35154190379.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/69845328108.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/93640525252.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/xumebikinuwudu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccc602a644---16782234669.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311172771431.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/19572771046138cdd700c91.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/99071597978.pdfIn PDF document text
    • https://oasis-travel.ro/files/24647411314.pdfIn PDF document text
    • https://proia.bg/userfiles/file/22024354778.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fusarogofuvu.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/83340520860.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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 13544 bytes
SHA-256: babe32cd8aedd14ce6ac95f23167c4a69f6db03ae8575d38006b667661956e23
font_01_sfnt_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 11036 bytes
SHA-256: f8308f477c803fed59ba7ea60a6d422e0e2395df535b3a7c46e2e66dc2aeaa8e