Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd87998c0bf9b1a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 04:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6bf7d4209239c570063206fb88b1b385 SHA-1: 0c6fdd99cac73efc17f3032df2fb40da7cdb9771 SHA-256: 8fd87998c0bf9b1a4c4354ca180f3553b79522f1eb894913b112e8067ae4c819
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of a URL related to 'instagram password finder' suggests a credential harvesting or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://happyorderfood.com/uploads/files/68312096453.pdf In PDF document text
    • http://ustunongel.com/image/files/baromokerewebavoruze.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/nufibekemex.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/katerub.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/duvax.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/36247519299.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jetonek.pdfIn PDF document text
    • https://panama4d.com/contents/files/24395503804.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/kewamawitezukuxanomudut.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/20257705189.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/28179134520.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/82914084955.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/37020858826.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/89953285846.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lefup.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1b1e5a06---40742336540.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82856387074.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zodusefojetobulalanijan.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/29706428363.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/gadoweneravarogagazetimun.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/84853527776.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/giwijilami.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/kalopofawenukuginosi.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/26774415.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/pokobesifuwalekugixetok.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/mugarojukomikukekew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=instagram+password+finderPDF 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_off0000cd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD91 17236 bytes
SHA-256: c48b48279551ace9fb8714b90dca7bee9e0197096de39e9ecc3bb71bb187d7b0
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 10832 bytes
SHA-256: 92215fa33823bf6e3fbd9a430c1c19ef5658aa1b79542d79764ae66849c7eaae