Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b31e3558225f95…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 15:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 726aed042b301b3ba04aa2e1c4884678 SHA-1: 3607b8cf423f56a4bad746afd48856fdfbb9e247 SHA-256: 03b31e3558225f95892b2a531ee6b9935e83268c1d2bebe80b584f04e5d3ad1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external links is sufficient to infer a likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=a+quiet+place+1+streaming PDF link annotation
    • https://phm.vn/upload/files/joragabixaseserakexota.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/kenekixuxekobexef.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109040546154762.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/30769096985.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/34338890991.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/nudijabobij.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/sogowamukuwozuvudefa.pdfIn PDF document text
    • https://renteci.com/imagens/file/32058987986.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/supejamuzuniwu.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/papozanakisev.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/73650566735.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/85368717786.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dodilakak.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210902_195812.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/tegolig.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/56709823683.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6be0b2e3---leretur.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/rosesunuzaxekopus.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4d5d87c33efb8de2211a7b1005bd975b/69318476737.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/50807570332.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/67237113629.pdfIn PDF document text
    • http://ucokampen.com/media/files/kejizopowovuva.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xalixazotokezimojek.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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 17704 bytes
SHA-256: aaa4d1fdc2b8614bed484d4368842e0c29395356aa079bd0d01eed558c0953ab
font_02_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 10876 bytes
SHA-256: 6f0bd2562ffc1143de2862aa05fcbb01fc192a75626420ae59e7d9453f0dbae9

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