Malicious PDF — malware analysis report

Static analysis result for SHA-256 3662e6b4f113a88d…

MALICIOUS

PDF

71.2 KB Created: 2021-02-23 13:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0b6523a6b260ab0b73699c4f03ed12de SHA-1: 63a598123dbce482d38edd53e57c7e73fa8b0aac SHA-256: 3662e6b4f113a88db4ef4a7337311a89db3328347173dcaa9ac261d790fbd710
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of embedded links forming a link farm. The ML classifier also assigned a very high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=mini+head+soccer In PDF document text
    • https://ligepakege.weebly.com/uploads/1/3/1/8/131871609/7363404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5fe1fb8fd5bc7.pdfIn PDF document text
    • https://finudekenituw.weebly.com/uploads/1/3/6/0/136053274/5b0711584f.pdfIn PDF document text
    • https://tinubuwetoka.weebly.com/uploads/1/3/5/3/135325034/femanamapigofaw.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/ragimek-vitaxowonirek-tamipoxo-bifap.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/7477833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_601bfa9ea8f1d.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/31d24ad4d.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/786cb.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/sazinosijajanemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff29c44021da.pdfIn PDF document text
    • https://fuzidofan.weebly.com/uploads/1/3/2/6/132695445/617117.pdfIn PDF document text
    • https://bumopajuri.weebly.com/uploads/1/3/0/9/130969054/7c6979dfd.pdfIn PDF document text
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/31a740f89486e.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/nutojasegi_zizimibogijot_zitibam_ladiva.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/geraf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • 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_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 5000 bytes
SHA-256: ee2136cf7cc42c5cf14c0820a0dd1c222e3f28ae9534b70e53dc314d30deb443
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10208 bytes
SHA-256: 88acccb6b35fa327e98a59aef34ae4ba9c19f68c73963df7d6d280110d99c204
font_02_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16204 bytes
SHA-256: eff505afb8e26c38bee6bcfe2a1fe7ec06ef672c1b18ea48f40a557974472291

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