Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2bfc7e3c64aee3…

MALICIOUS

PDF

71.8 KB Created: 2021-02-16 03:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1b123a00ef836c1a8b19b7c6673042b SHA-1: de68a025a92002a0e098df56eefb2a2dc351d052 SHA-256: 8c2bfc7e3c64aee303718ede008e848619bb9132ccffb89f61d895cdad5c444b
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded links, such as https://crophysi.ru/strik?utm_term=rita+hayworth+and+shawshank+redemption, suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/strik?utm_term=rita+hayworth+and+shawshank+redemption In PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/2iiifge/divarication_of_rectus_abdominis_muscles_dram_postpartum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_601e248caf043.pdfIn PDF document text
    • https://cdn.sqhk.co/sonometa/Jgdijie/finunojapadafifiwokimov.pdfIn PDF document text
    • http://bidusifekinu.66ghz.com/vmware_certification_guide.pdfIn PDF document text
    • http://koguled.22web.org/vogebema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601132a231e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6023e217dbe95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc9908620bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_600a9b1a02148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_5fe66170c7839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/ridupanomaminogiz.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/chakram_telugu_video_songs_free.pdfIn PDF document text
    • http://wexugemo.epizy.com/didupixijajulejabozaxaz.pdfIn PDF document text
    • http://ruxazek.epizy.com/10380110805.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/rekopefev.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/tusaf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 5432 bytes
SHA-256: e13c9037370461d401710cc610acfeda69ccb8f2101b4237509a37acb19141c5
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 10488 bytes
SHA-256: b40f3e2844361b69b07f6274b5655d11506614b6bfe74a78c75e4b3b5b86d680

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