Malicious PDF — malware analysis report

Static analysis result for SHA-256 356da49aa939ab04…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 285c0bb70bc211a40db45a26a980df70 SHA-1: f4ce8f68ec5790a22cb5088105d1a1c48b29d556 SHA-256: 356da49aa939ab041eec33a88610d45904f919b363da09e8afc9d5fb67cb6554
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting an attempt to obscure the true malicious destination or to distribute various payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely involving phishing attempts or trojanized content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stratasphere.online/userfiles/file/95680324806.pdf
    • http://xhiehchin.com/Xhieh_News/_file/25758851741.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/18015624257.pdf
    • http://ativn.com/upload/file/lebibuparebexasekog.pdf
    • https://millinerandassoc.com/files/file/59059284692.pdf
    • http://goddesshair.net/upload/users/files/fefozinexog.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/zoxeselofef.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/61984348261.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/18239587944.pdf
    • http://image.dlib.vn/libedu/news/bachviet/20210914/file/rimezuvumetadotilik.pdf
    • http://tomei4x4.jp/js/upload/files/xozurati.pdf
    • https://vinaconexmec.vn/uploads/news_file/9468889014.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/84014474436.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/80777887347.pdf
    • http://holidayservicemarsala.it/userfiles/files/19359767745.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132861aebd31---fopadi.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/75230230290.pdf
    • https://asthasupermarket.com/userfiles/file/fiburutejin.pdf
    • https://davidfoleyinc.com/userfiles/file/50733052278.pdf
    • http://highlevel.pl/userfiles/file/bumodubegifulurobe.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/54787837001.pdf
    • https://careerroots.net/ckfinder/userfiles/files/27435926359.pdf
    • http://wakabaeducation.com/userfiles/file/moxopametad.pdf
    • https://ssekolkata.com/ckfinder/userfiles/files/26007013706.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=como+instalar+o+whatsapp+plus+no+android
    • 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_off0000e67c.bin
a54493babad9bcea92abd682fb23825e5b2d700dcc3c31cabac645ea27c14b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 19020 bytes
font_01_sfnt_off00011779.bin
b9813a4ac921679d9783029b2946264dd542c349e39507de7dca2f6da305cda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 10740 bytes
font_02_sfnt_off00012ffc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16792 bytes

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