Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0b6b726b58f6bd…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 22:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ac412d1a3d22c18f8d49e07b849297b SHA-1: 68987238cc6386780ce7bce938cd5db62154a72b SHA-256: bd0b6b726b58f6bd30d4edff09477cbd7efece70baa88b2bcb55d05ecfd5fedd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of `utm_term` parameters suggests tracking or redirection, common in phishing campaigns. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=world+of+goo+android+apk PDF link annotation
    • http://peoplefineart.com/assets/202109/files/20210904025219175112.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/jonomawopusodoralojob.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/36670721727.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/jufimuwemelenujeba.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/18230030577.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/86615636066.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/salefof.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/98184838591.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nosakopovokupiban.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zefumonilebusotujoz.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/gemugufedipesuxilezig.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/nupugetolumobukivobomi.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903051135.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/33983417301.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/mujadujugefutereva.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/beputebunof.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xakamewadenabumisarav.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rc34etmdkg29cmsgd2dj6jvc23/40136812504.pdfIn PDF document text
    • https://tch.lu/files/files/tovapaputedadiferezon.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c64c39d18---73684335795.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/38282898524.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 21092 bytes
SHA-256: e668f47bc4db6fe64b2e806099af7d0d4057bf58886f9fb669f7c8feafea6896
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 10360 bytes
SHA-256: 0dacca3bed1e9659294f44bc92ff4f502eef6b22ef84b3ead7b5d7ee13fe8b40
font_03_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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