Malicious PDF — malware analysis report

Static analysis result for SHA-256 4155bd51d753ed17…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 14:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53c17a06d9601caa1d7855cf9f9a06a7 SHA-1: 80359d35ddc14bbea55d99fee2cb6e6eb9758ee9 SHA-256: 4155bd51d753ed17a3c75669f3ee9154b6bf2ed0c9b905fe75c0ecb46cd7ceed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=2k+myteam+codes PDF link annotation
    • http://sdes.in/uploads/44310949782.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/solavugadorotibo.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/35795445864.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/62364951953.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/87938925848.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/nenipopi.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/zitadurixumiviwadi.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/poburuwepolanimikeguz.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/juzupojazifugufu.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/14687476825.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/67379544277.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1080190c---titama.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/15252984652.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gagid.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xuwanolimibirubujeg.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/9152351645.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/fetelise.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pipukiluzikavutal.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/gineremudumutenudusiwowu.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/792533295.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/34711899574.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/95298011894.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/62572688482.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lilawivekezorokuze.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nijipuwe.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10416 bytes
SHA-256: ce5780e0e391f2e7aa05ceb701b5abf3b836165f459570d4a1d1ff33d2bd476c
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 18688 bytes
SHA-256: 4d4d48bc4fb7578558f573b1724bb5a8636c483985f1648e254c6dc449a3cefc