Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b8484b3a36b7eb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 00:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2b6050295edfc33cfdc30ee4668f3e2 SHA-1: 0c17bd1febe787694442fc3d3408c2aded3b7830 SHA-256: 58b8484b3a36b7eb5132371bce0a2f8bd57efca2fcf60cfbb4d95f0858e54974
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to various domains, suggesting it functions as a link farm. One heuristic specifically identified it as a 'link farm on disposable hosting', reinforcing the phishing or malware distribution vector. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://arab-hams.com/Ups/files/20779320399.pdf In PDF document text
    • http://fpempresa.cen.es/userfiles/files/68393886574.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/82439447823.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/31068617768.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/40594280815.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69b026a1---6967323631.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/jebesuxugex.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/fuvegut.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909211157.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/romiguwalaramiwixikenuv.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210903_120315.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/58751816425.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wedazubedozavilunubebuf.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/94474368379.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ccc62e218---gowumitojogineleg.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/xokisuwaraz.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/kefoxusosedax.pdfIn PDF document text
    • https://istanajp2.com/contents/files/kaxesadipet.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/57414384278.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/47072098867.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/durijewegibuwotos.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/76099261052.pdfIn PDF document text
    • http://zeci.nl/im/image/livupogaxukewidud.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/10262521892.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/46562936514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+check+outlook+email+on+androidPDF link annotation
    • 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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 10736 bytes
SHA-256: 91d2c77e581110ddd7cd6e70908c9cd7e4c341cdf30691f380ca0780e227ec7b
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 18140 bytes
SHA-256: e3fc06adec793d545a37e43b01d664e855d11933e071a1b22199b4cabd386f27
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1