Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96b3cdda5f826ea…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 23:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28311f5f5f5ed665b6bfc2de1cd2e693 SHA-1: 7b6e28e5d92a4b0f70ff0921db5aaf2410413df9 SHA-256: e96b3cdda5f826ea7c2641520a02a5d7a5439a4ddf28a4e838ea84293ba02de5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, strongly suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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=live+stream+apk PDF link annotation
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/noxel.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/robetonu.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/33510534502.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae986ee42---zugoj.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qm33gr34t16c3ugfopv2h88df7/63299540685.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/begepapoposonije.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/romowi.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fepaxixumazirevokewipoju.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/97160268564.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/mikefo.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/birinimawetavojixuri.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/77354748448.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091010510411.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/62712724359.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210917174603_1578192973.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/miwonuluragijokalumo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/vupipimekifuwo.pdfIn PDF document text
    • https://limsurempat.com/contents/files/79555627847.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/bodimavepefojev.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kezero.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/94448765075.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_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 16704 bytes
SHA-256: bec9afa689917b6acde773ab529dcd40c979fda7f2e279d7556c9eec05b52545
font_02_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10256 bytes
SHA-256: bc14610a02a5bc0f9a391835e7eae5b5a60a9a592c9ee6d63c7fc0a561412f8d

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