Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d796e533ed709f…

MALICIOUS

PDF

67.6 KB Created: 2021-02-14 05:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e2157dc93c7e13d6af9b3f2ab4a6b49d SHA-1: 387df554bcd59a941c29ddd6cba764b7704b5934 SHA-256: b1d796e533ed709ff8135403f8cd294010f33dafc3f472e5d9bab6e3519969fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'maypoin.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host multiple links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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
  • 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.
  • 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://maypoin.ru/wix?keyword=baby+peach+plush PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd66771a2778.pdfIn PDF document text
    • http://wuwodijutorem.iblogger.org/time_inception_sheet_music_patrik_pietschmann.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_60208cea38695.pdfIn PDF document text
    • https://wopinifem.weebly.com/uploads/1/3/4/8/134884590/8435334.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/donuzenili_vujifu.pdfIn PDF document text
    • http://tegeboxurogon.iblogger.org/mojafiwagodovinusu.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/0a8679.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/8839790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446019/normal_6001cf7f28905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fff6b340bae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fd1134a9cc12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374984/normal_6000b3d4d6a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_602438163fe56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rifoxofome.rf.gd/cpt_incoterms_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/wajokuradubinexe.pdfIn PDF document text
    • http://jorowiwiboxizuk.rf.gd/gudik.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/99139348490.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/flannelette_flat_sheets_super_king_size.pdfIn PDF document text
    • http://besuwodusibix.rf.gd/80702005571.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/saxunilininavuj.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_off0000cd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 5216 bytes
SHA-256: c9302bcf4f99f9ddd9965bf5cc3c73cf931013a967566535a6da0ef5ff2e48b6
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10068 bytes
SHA-256: 7f31caa71546164e75b921586aa6fb0d0be1ca1026e94a02aaec56298ee51412

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