Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4635c4c488ac31…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 12:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c3cfa7762ca037ecaaf724c966a509f5 SHA-1: 1a4fa7ea445881079ae155bdacc82d23f2d95e52 SHA-256: 0a4635c4c488ac31c143ef56aaba3f3567b68207f4f74b53915f5c0b8ccdff24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to other PDF files hosted on disposable domains. This suggests a campaign to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://radmangroup-ye.com/rgfiles/file/92196552864.pdf In PDF document text
    • http://apvn.info/userfiles/file/7418660476.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/93119009264.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139346d08f09---90058245893.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/10724123685.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/tejofemobegisovexabuboja.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/87590873117.pdfIn PDF document text
    • https://alkoplast.rs/files/72083407384.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/nuxevovufazaxe.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/63699981608.pdfIn PDF document text
    • http://jarosi.hu/files/file/foxumokadupozeto.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/kebupeletoxirefewukere.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/lifido.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f3eafe2d---23253299542.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/wunupiv.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/suvibexejikumapulawujexut.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mevomafimi.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/liruxapi.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/bejinixugotilukuvil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=siete+esqueletos+decapitados+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/vizowubotejasela.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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 20340 bytes
SHA-256: 726ccb18eda12a32dbce1c1b0c86a673a08b83adacab6840f5ff7f9e7bd62355
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10732 bytes
SHA-256: bd60757b66fb9eed9b13cf83267d2c2557adaac3158839fc18f2c520f34831e9

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