Malicious PDF — malware analysis report

Static analysis result for SHA-256 d556517a77e70bb6…

MALICIOUS

PDF

75.7 KB Created: 2021-02-25 00:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd71e06d81064ce42eba14311c68b4f2 SHA-1: b9721bb6066742533236a0ebf22036cf28c1f7b8 SHA-256: d556517a77e70bb6be177329fd94491de581e03de1820057ba6dceecae6a1161
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://yafferge.ru/strik?utm_term=samsung+galaxy+s4+mini+price+in+india'. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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=samsung+galaxy+s4+mini+price+in+india In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408875/normal_6008cf7881486.pdfIn PDF document text
    • http://goldstein.berlin/79441547137jbuj2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5ff0416b32795.pdfIn PDF document text
    • http://podeves.xyz/avery_cd_label_templatesp9lok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fce90f1d6624.pdfIn PDF document text
    • http://phtech.site/935660654272oiq0.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/relion_confirm_meter_manual.pdfIn PDF document text
    • http://umkatrade.ru/ark_gewicht_erhhenk8f3z.pdfIn PDF document text
    • http://lifeeuro.info/batitofazaxevodatapufk9ocd.pdfIn PDF document text
    • http://thecet.xyz/hot_zone_miniseries_episode_guidedxqa7.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/what_are_three_biotic_factors_in_a_grassland_ecosystem.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/numowuwo.pdfIn PDF document text
    • http://recepty-dd.info/digital_communications_manager_interview_questionsn5u5w.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/31633886039.pdfIn PDF document text
    • http://weraka.online/wedavuxebovojenez8efri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelefufod.rf.gd/spotify_premium_apk_gratis_ios.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/goldilocks_and_the_3_bears_worksheets.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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5756 bytes
SHA-256: 2de81a343d385e163ebdeb6950d06bd371ea1c1daad8b7593c329ef2aa12397a
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 10700 bytes
SHA-256: 3bdec9415f5475cc36afef50f04630749d26186e5176dacfddf242842ceabb32

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