Malicious PDF — malware analysis report

Static analysis result for SHA-256 065db4b25ce59ec4…

MALICIOUS

PDF

73.6 KB Created: 2021-02-20 12:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4dea1e011dbf8f75a0244ba818c28333 SHA-1: f769a4e29d01756209dd3502e87f7f831dec0614 SHA-256: 065db4b25ce59ec4aa1706dd8bc66cea794cd53c6e82c0d9539267ea51c128e3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains fragments related to angel numbers and application metadata, suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of malicious links is sufficient evidence of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=what+does+441+mean+in+angel+numbers In PDF document text
    • http://zofanelo.22web.org/fiman.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/gogjhfE/evacuated_solar_tubes_reviews.pdfIn PDF document text
    • http://thrivewebs.com/15554769976685n4.pdfIn PDF document text
    • http://homearfes.com/xokepopanis6fy.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/3309488.pdfIn PDF document text
    • http://maska-respirator.com/former_american_embassy_ho_chi_minhvcvev.pdfIn PDF document text
    • http://tramlaweq.online/41218116320m4miy.pdfIn PDF document text
    • http://ihsteam.ru/good_drum_sets_for_beginners5idmn.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/bjbihIZ/forugatade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ff01cbbc25c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_60046cef6d461.pdfIn PDF document text
    • http://meetchat.space/edit_super_slow_mo_s10yvxdg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boraxatisota.rf.gd/xixopapururutijuvavijirir.pdfIn PDF document text
    • http://walexesanub.rf.gd/kosisa.pdfIn PDF document text
    • http://winupenelipumo.epizy.com/lansakan_worksheet_grade_5.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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 5532 bytes
SHA-256: aaebfb7b56f1f05abba9cb78e999ef744f7a0cd6d7120a831ae146c053b452bc
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10528 bytes
SHA-256: 5454afe4f1d1b294f2ac6e12e2a7f1af59cecdf96206348a4014662ecf0022d6

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