Malicious PDF — malware analysis report

Static analysis result for SHA-256 1350faafa0173426…

MALICIOUS

PDF

79.8 KB Created: 2021-02-13 14:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1c15b457f687771fb026dc39bb172e8c SHA-1: cf093f5b6f059c5ca175c0d198323c9040165336 SHA-256: 1350faafa017342620bc85eb501a89888b5725b52ea350f6fded0c757770d6d6
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/wix?keyword=70+486+ebook+pdf+download PDF link annotation
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/c3e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_601d9620d0ae9.pdfIn PDF document text
    • https://denosofebulapan.weebly.com/uploads/1/3/5/3/135347567/sapipadogopubogojaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_6017714967522.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/QBgjiiM/mopopujusosumavo.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/SjhGXpg/10810013008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5ff27cbf858d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5ffba4e7702de.pdfIn PDF document text
    • https://suretazusidik.weebly.com/uploads/1/3/4/0/134012564/tojobuku.pdfIn PDF document text
    • http://kebotup.66ghz.com/bed_sheets_for_sale_in_south_africa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafikepuvanotu.epizy.com/mubageweforiboselawoku.pdfIn PDF document text
    • http://jabukejezari.epizy.com/gds_committee_report_today.pdfIn PDF document text
    • http://zowisoburime.rf.gd/gezemosiganeraxiwadite.pdfIn PDF document text
    • http://pogogap.epizy.com/28040516436.pdfIn PDF document text
    • http://kukatunudivolu.epizy.com/gukexoxanegoripowe.pdfIn PDF document text
    • http://bibesatu.epizy.com/32030648982.pdfIn PDF document text
    • http://koxogulu.rf.gd/phishing_email_template.pdfIn PDF document text
    • http://tidaxapotemi.rf.gd/nisedotavajajifujet.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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 5620 bytes
SHA-256: 0f218980a98efc9d6c6238d37e607818c0b17cf6b7bc698351deea128370be42
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 10400 bytes
SHA-256: 50a1ac51cab4db6dc6a8ff008f54e7132d750c7dce5ef2c9350858fc6c6cebaa

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