Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e01fdaa72d875…

MALICIOUS

PDF

60.2 KB Created: 2020-11-29 12:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9d352534d98d96340f2a30461c9c6e SHA-1: 531c83c71b8c480642726608fd46609de4b863e3 SHA-256: 9a5e01fdaa72d8751c1c232902fc3a7442522c3225dd1874e9546a2d42a70f49
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL related to viewing YouTube videos. It also hosts a PDF link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=how+to+view+unlisted+youtube+videos
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/neruludikare.pdf
    • https://kukezedom.weebly.com/uploads/1/3/4/6/134629177/4094678.pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f9f314df34d3.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f6e41bc-c9c8-4024-8ef0-b033dcf70650/1306244113.pdf
    • https://uploads.strikinglycdn.com/files/7fb8e926-a6ad-4d54-94ec-18e24a0e3181/gijegitajusexadefa.pdf
    • https://s3.amazonaws.com/fizup/cvs_pharmacy_technician_assessment_test_answers.pdf
    • https://uploads.strikinglycdn.com/files/5324c237-c81c-4609-8475-fd6a6f5cf9ea/95666723063.pdf
    • https://uploads.strikinglycdn.com/files/6a9b8ff9-0320-48e6-88ec-734b3920d12c/bipawevegexun.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/tolopevokolarajone.pdf
    • https://s3.amazonaws.com/serogajugomiji/14172568494.pdf
    • https://s3.amazonaws.com/sojuravewi/how_long_do_direct_deposits_take_to_clear.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b14c.bin
a0a870948d40d24d027cdedae79b95b44e80382d5cfdcc58cd85ce57a361f2f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 4868 bytes
font_01_sfnt_off0000c204.bin
e931699ec8064836a8f2a6e0b73a2d787aa0cf02be593aa499dccb4812602e69
pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 9984 bytes