Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9c42de59bfb0b1…

MALICIOUS

PDF

66.6 KB Created: 2021-10-05 13:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3ef353cbd4fff0976b9e9417b2fe28bc SHA-1: e12df1acfacbfe7c6145876e82aee6c9b58ab208 SHA-256: cc9c42de59bfb0b1560b0286b704479f03f7dd37d8c2a1aac2cf9cddb0fb6858
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, with one specifically pointing to 'https://cructi.ru/uplcv', suggesting an attempt to redirect the user to a malicious site. The document's structure, being image-heavy with minimal text and a click-outward action, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 66 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://cructi.ru/uplcv?utm_term=listening+english+stories+for+beginners PDF link annotation
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/18051264274.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/81191643507.pdfIn PDF document text
    • http://premo.at/userfiles/file/sinobatopiner.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/xedefinivukupub.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16159447c80808---wezisatujonifazijelot.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/3711629601.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/zuwunibakiwonok.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/41151217063.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ac08dcf774354e89f992c02e8f2cad80/nazatixeruxolilav.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/sekus.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/93926418462.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/wobomolisidipojeta.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/kinugejo.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/pipuv.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/97684201248.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/80917236315.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/kadafoferipotazovodot.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/rikiwadebo.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/befinejojozil.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210901231716.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gufipowiber.pdfIn PDF document text
    • http://soc-in.com/data/media/files/71868688219.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_off0000abfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABFD 13520 bytes
SHA-256: 7dda561223a5604d542da58db99952145f3373be7a9a0c89f7ee38e140fe55cc
font_01_sfnt_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 10428 bytes
SHA-256: b33d22b7e3d3549903167aeee086f4ad0d81514eee7ac014b27c53a1d7a48514