Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9c343cee83c912…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 20:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6046e755ebdc254260beb3e1aafe65ca SHA-1: 28a4b8ac2faf6da4cfa6bfa3c221e38fda849777 SHA-256: 4c9c343cee83c9122f5c33e37d93907755423f6910d6b5393df5b95f27bbf321
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to known malicious redirector infrastructure and disposable hosting sites, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to further malicious content or exploit kits. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

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/wix?keyword=jaclyn+smith+christmas+tree In PDF document text
    • https://cdn.sqhk.co/rotonoba/JDja6jj/horse_jumping_3d_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/hNhjgjP/wordbrain_2_word_baron_vegetables_answers.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/luvutizozi.pdfIn PDF document text
    • http://ludshop.xyz/jatum0p2fv.pdfIn PDF document text
    • http://ledy66.net/98953819485ush5t.pdfIn PDF document text
    • http://blaugrana.ru/2006473286l23pt.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/ahhjZHL/discover_gandhi_mobile_app_quiz.pdfIn PDF document text
    • http://getchambre.xyz/canada_election_candidates_platformf6jwj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601b43a11cb27.pdfIn PDF document text
    • http://bachanalytics.com/dazuvewomefiv3s5f.pdfIn PDF document text
    • http://avto-document.site/kemajenivimazadug89x2.pdfIn PDF document text
    • http://samelike.site/46740516563mtksq.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/tom_clancy_the_division_ps4_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_600cdf2a79165.pdfIn PDF document text
    • http://starkrobotics.org/kindergarten_teacher_s_guide_2019apfie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5fccce22d21b3.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/best_rig_for_saltwater_pier_fishing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 5132 bytes
SHA-256: 4b5643ad021a4433d8cab52fc56fbff76109760be7e9bb3e6f664936b22e937c
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 10380 bytes
SHA-256: e86fbd4d14f9d2d705e17edd062eb38e324de6f66696e014313b88e323106baa

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