Malicious PDF — malware analysis report

Static analysis result for SHA-256 f630310b3e864c2c…

MALICIOUS

PDF

142.1 KB Created: 2021-02-21 02:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4606ca8f538751dd7411fb5e821468f0 SHA-1: feb5597d572f0df9bfafa175e07c380c359300d1 SHA-256: f630310b3e864c2c6210b859f59c0cad5d7942de08666f418a404674230b15af
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a redirector link to 'https://yafferge.ru/strik?utm_term=free+online+bedtime+stories+read+aloud'. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=free+online+bedtime+stories+read+aloud In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5ff6762089f65.pdfIn PDF document text
    • https://pavedivagew.weebly.com/uploads/1/3/4/4/134468388/b027b11ce845c.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/fiiihle/final_fantasy_14_ivalice.pdfIn PDF document text
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/raborugosapaduj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fe09e0b8dc48.pdfIn PDF document text
    • https://gitemeloduj.weebly.com/uploads/1/3/1/4/131406811/6448446.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/jfgdEIB/10590299040.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/2383280c72b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_602462c6d8eea.pdfIn PDF document text
    • http://nazevulilabume.66ghz.com/jibusarivuwuvaramuvixoga.pdfIn PDF document text
    • http://kikudesazogug.22web.org/5604673557.pdfIn PDF document text
    • http://sanadewa.iblogger.org/archaeology_magazine_2017.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/9583005.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/nowasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogewarixisude.epizy.com/50433988087.pdfIn PDF document text
    • http://wedofisirix.epizy.com/32178271198.pdfIn PDF document text
    • http://relogevavikidid.epizy.com/aqualung_flute_sheet_music.pdfIn PDF document text
    • http://vawovujuju.rf.gd/katugajuf.pdfIn PDF document text
    • http://gamovomubapo.rf.gd/bipegokovepafemovalim.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/advanced_custom_fields_pro_nulled.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_off0001f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F51B 5064 bytes
SHA-256: f409ab1e3d18eaa79e1b94b68ed6bfcae09b22173257731bb3e3d0cab40ed39c
font_01_sfnt_off00020633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20633 10776 bytes
SHA-256: c6fb7e031b0ebc7c08cbf616e2dfea485f2c3b776e8acc0e0f4efba6e7c16770

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