Malicious PDF — malware analysis report

Static analysis result for SHA-256 58893da72590c830…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 17:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23da18c7021fbdc1280521687502fae3 SHA-1: 1a02c3c7726fd206e0dec81668f2900bc61e1597 SHA-256: 58893da72590c8301f6ae69fefa7a5f3a14665a00e219da05e62f6b12a3ef559
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://js-space.de/userfiles/file/xokov.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/77559283827.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/5453057490.pdf
    • http://avvocatogiuliani.it/userfiles/files/64756449388.pdf
    • http://musicpark-live.com/userfiles/file/regaxefek.pdf
    • https://ntc-container.com/upload/files/32349812391.pdf
    • https://smsenerji.com/resimler/files/sokubisiwosepogopifeguget.pdf
    • http://pekingtogo.com/uploads/files/bawap.pdf
    • https://shipnhanh247.vn/asset/files/sifamig.pdf
    • http://louisamerino.com/userfiles/file/56287847476.pdf
    • http://pokewaveanaheim.com/uploads/files/64846208325.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/fisunedepaboxesarizi.pdf
    • http://resortvillairene.it/userfiles/files/vazonugujibipawu.pdf
    • https://www.casestilistas.es/ckfinder/userfiles/files/gilude.pdf
    • http://microcement.ua/userfiles/file/nobevaluxexage.pdf
    • http://webbyshoe.com/fckeditor/userfiles/file/88728827554.pdf
    • https://twr1115.net/files/fckeditor/file/zuzokinamoniruwonitos.pdf
    • https://zzwgjx.com/d/files/lujomokepelidomijekix.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/teviwa.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/34320185047.pdf
    • http://www.anaja-inter.org/public/file/befiteraxidikosenudi.pdf
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/fajovovopevotebu.pdf
    • http://verzorgingsindex.nl/images/uploads/lagepokuweno.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chromecast+4+hong+kong
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad71.bin
eff0e8f74bba87f5c64c5deaadc1a9ac3191e0774e67dcd4c8d2df356a8118f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD71 15928 bytes
font_01_sfnt_off0000d599.bin
1e3ba6dc14080eaabb4f2e342e531ec77953484ebaca3471988cf9ecf182eeb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 10740 bytes
font_02_sfnt_off0000ee40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes

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