Malicious PDF — malware analysis report

Static analysis result for SHA-256 161ec97e4fa93ea9…

MALICIOUS

PDF

91.0 KB Created: 2021-03-14 02:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4e031ea4b449f63ff20cf1971e5449d8 SHA-1: 2570afb6c397237ff56e90ded990e8585ba89bcf SHA-256: 161ec97e4fa93ea9ebeab29894c539768ea3e0a7b35226dbed3eae4469a1a8aa
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and contains a significant number of embedded URLs. One URL, 'https://crophysi.ru/wix?keyword=best+anti+gravity+racing+games', is flagged as a malicious redirector. The document appears to be a link farm designed to direct users to various external resources, potentially for phishing or malware distribution.

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://crophysi.ru/wix?keyword=best+anti+gravity+racing+games In PDF document text
    • http://theboldpantsproject.com/estrofas_del_himno_nacional_de_honduras_y_sus_explicacionesm3x0a.pdfIn PDF document text
    • https://sidonakitipu.weebly.com/uploads/1/3/4/6/134631457/jorobelunutid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_60349751c5f52.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/69769.pdfIn PDF document text
    • http://blockhcain.host/mta_map_nyc_2020u0beb.pdfIn PDF document text
    • http://sallehub.xyz/now_hiring_template_microsoftx2gv3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fdb1ab8dbd02.pdfIn PDF document text
    • https://mopopapepiror.weebly.com/uploads/1/3/2/7/132741339/dasixiro-gitesexubara-nobasufowejik.pdfIn PDF document text
    • https://nenuwuxajifop.weebly.com/uploads/1/3/4/6/134665141/8764439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_600c789c6c014.pdfIn PDF document text
    • https://nilanifek.weebly.com/uploads/1/3/4/4/134466172/vegifevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_601dcad107a0c.pdfIn PDF document text
    • http://libunekuba.iblogger.org/11441339811.pdfIn PDF document text
    • http://sendgrid-de.com/jurugiximovuderikajokufxbmuf.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/4030462.pdfIn PDF document text
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/0718ab4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_73aaf4aaa65a491097d1271a88f0d8b3.pdf?index=trueIn PDF document text
    • http://gapevizatijaba.epizy.com/19058996484.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_245ef5a209644dfd8be874c884062e77.pdf?index=trueIn 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_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 4976 bytes
SHA-256: e06c721a5a42469ad1cdae7856eb667b6fb73eea7daf04cbc297a20b2f253e4a
font_01_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 11164 bytes
SHA-256: eb85a73c1e5fb745c62015ff4b73721c4c6fdda313fc507ba860d29e33f06e89
font_02_sfnt_off00015084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15084 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c