Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59a6b475a02e737…

MALICIOUS

PDF

78.5 KB Created: 2021-02-22 10:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 48446f6bd8d28b1afd5673553819cf5e SHA-1: e48b3ac26e7e31610fc42a0f0f07154a83e01a07 SHA-256: d59a6b475a02e7370cc61625a81d7d208ecce57fe29347c962548ac5e9307309
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic firing indicates links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used for phishing or distributing malware. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://yafferge.ru/wix?keyword=endovex+male+enhancement In PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/3590d.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/RHigRgf/godzilla_defense_force_mod_apk_2._3._3.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/7734524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fe808ca666b6.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/nuwosatuzufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_6011464a5f1d5.pdfIn PDF document text
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/9338110.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/Mnxifhd/ppsspp_psp_emulator.pdfIn PDF document text
    • http://vasugixoba.22web.org/atom_platformio-_ide-_terminal.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/lufosi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_5fe5d07323890.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/1394672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5feaf56b81f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/cprjjjf/download_aplikasi_block_puzzle_jewel_2019.pdfIn PDF document text
    • http://xuwamamesatopa.22web.org/finite_geometric_sequence.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/beniwivavevobe.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/jikinetepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewasijibakel.epizy.com/35630463061.pdfIn PDF document text
    • http://dodupubi.epizy.com/how_to_change_unit_on_luggage_scale.pdfIn PDF document text
    • http://jurukukixinom.rf.gd/55673731281.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 3384 bytes
SHA-256: ebfb67c147d1dc8a2a1a40e5f7e8b1e82123cb8a46be8cdad0068e31fd5d7b37
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 4992 bytes
SHA-256: 990481f6cefa2aa6196b6e4b0fd20fa9362ed5a5de2b3f1daf857343fa4e13c9
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10324 bytes
SHA-256: 5627b3dd15bff4dc098af7a16a14cdfea611dd387491cd9adec236584920a7f5