Malicious PDF — malware analysis report

Static analysis result for SHA-256 403a1a75e97a429e…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 22:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9838448207cd2cb91dbccfb03d162e29 SHA-1: b2094cbf59d19355b985e29c653551310085db48 SHA-256: 403a1a75e97a429eeb3f88feb18450ef90041396507922a2a59c42527c3ab083
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to search terms, suggesting a phishing or scam attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://dafemum.ru/wix?keyword=sadlier+connect+level+f+unit+3+synonyms+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5ff276c6ccf51.pdfIn PDF document text
    • http://hs-life.ru/vinexuzetikrj8fw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5fd2cc00a0eb0.pdfIn PDF document text
    • http://berozava.iblogger.org/zeror.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388060/normal_5fcb146634adf.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/QjhohbV/85057236739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454170/normal_5febb738ab586.pdfIn PDF document text
    • http://activa-fb.com/sesesibepopumuvifikugajeztp2g.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/45662098404.pdfIn PDF document text
    • http://mexicotop.xyz/317389726307tjo3.pdfIn PDF document text
    • https://cdn.sqhk.co/bumotinidopi/yhdE1hi/vejatosujogenax.pdfIn PDF document text
    • http://xuriretijidaja.22web.org/how_to_use_netgear_fast_ethernet_switch_fs108.pdfIn PDF document text
    • http://wenijivi.iblogger.org/from_a_to_zay_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce351c22af6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faluzarawajuxos.epizy.com/how_to_make_red_lobster_chocolate_wave.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/nunezejofux.pdfIn PDF document text
    • http://dewudirana.epizy.com/41096330136.pdfIn PDF document text
    • http://zotinebid.epizy.com/elliptical_arch_formers.pdfIn PDF document text
    • http://kobinegugagikag.epizy.com/ms_word_split_page_online.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/82134596486.pdfIn PDF document text
    • http://sidegiri.epizy.com/wilago.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_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 5688 bytes
SHA-256: cf27d7ac8998a898ade6359d58e1374097328648d5f6edcf681a9a997e4d9aa6
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 9856 bytes
SHA-256: d80e669e3f36e309f3b8529895248223a2557e31c0a5e7e47ea7d9e2b48a4afa

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