Malicious PDF — malware analysis report

Static analysis result for SHA-256 876cf5f0e9c7c2f8…

MALICIOUS

PDF

80.0 KB Created: 2021-03-22 07:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f632a66afd0729a33558a720825e8a6 SHA-1: 7b45b7dede1dfb5143f9180e70fcdc2e958e28d1 SHA-256: 876cf5f0e9c7c2f8fb46b7c3e67384fbbbc8fcc483a5d71902450dc1aec0a1a6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://seumenha.ru/wix?keyword=pippin+comic+characters, which is likely used to redirect users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pippin+comic+characters
    • http://bebolekuku.22web.org/97236207761.pdf
    • https://cdn-cms.f-static.net/uploads/4404955/normal_60475f9753baa.pdf
    • https://cdn-cms.f-static.net/uploads/4366371/normal_604fad2a554fd.pdf
    • http://mgacessoria.online/714556940239scmm.pdf
    • http://shoop-fh.ru/tosusinaxuxapajogomupurur38xv1.pdf
    • https://cdn-cms.f-static.net/uploads/4369486/normal_60306c9d2e8f8.pdf
    • https://seremojalunukeb.weebly.com/uploads/1/3/5/3/135393353/3151505.pdf
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5ffb3391ad8aa.pdf
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/4209615.pdf
    • https://dupubevanedi.weebly.com/uploads/1/3/4/6/134649007/suzaboxal_fogarexalo_zaluduliten.pdf
    • http://gtmedis.com/cortisone_injection_shoulder_bursitis_side_effectsby1vs.pdf
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/9163754.pdf
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5ff122a12a1ea.pdf
    • https://static.s123-cdn-static.com/uploads/4403413/normal_6008a66a0b6fc.pdf
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/9345895.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_8481e788a4234bcd873983fb2229cfec.pdf?index=true
    • http://rabejaje.epizy.com/molesejomusifeja.pdf
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_51f202c35df64297b014652012e92898.pdf?index=true
    • http://wisunabowogus.epizy.com/asus_p8z77_v_usb_bios_flashback.pdf
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_3ec372316f2b4e598e62e898e7b28c32.pdf?index=true
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_641a54c29d1148cfaf3f3e8206aa2ac5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc0.bin
872a2b6cbfe0d32e3293af432e3fc0a43f55a623480d4a94eea98486c78f2ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 4928 bytes
font_01_sfnt_off00010031.bin
9f13fb4552691ad8df71d563db9ca21bd74ee3aa95932ac680826a6115b56c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 10696 bytes
font_02_sfnt_off000124bc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 4324 bytes

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