Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b42ffce907a5c4…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 08:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94573919be1e368e2210a3ee26b84a3c SHA-1: 7ac05b60466dacfdb46a40db230d52ee9312ef8d SHA-256: 71b42ffce907a5c4b4dac137d98e05df373edad54abc4bd07248b007cde83098
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary browser update or extension. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=evernote+web+clipper+chrome+android PDF link annotation
    • https://elpollopaulino.com/cenavarra_userfiles/files/25521321102.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/mamuwuxidumegugem.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xozirajiweburuxisovusolo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/88620955049.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/20069300279.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138487b967f7---demejuxoxeluvegugakap.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/jasejuvuzomi.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xurozivopesufavidunowev.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/pabajujikafoga.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/43135713544.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/55446411213.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/kevegenureveb.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/wolaxolafex.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/renowebinofuxewegujepe.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wenumamewamukezafujadij.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/21621582948.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/43498200028.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/91396653247.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/wujapupaf.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/65989273882.pdfIn PDF document text
    • http://keitbg.com/images/files/9887776064.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/sujamozijuvima.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/zavawewan.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/medoku.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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 10884 bytes
SHA-256: 7078ff74c4be014efadb48a1c2a0c7751c748d36ff48d9a05af09593370413a4
font_02_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 19140 bytes
SHA-256: 81dd1dbe2631eb6125a46aa7418dc2433044fbb27ecaaae7fef93f05a1266e4c