Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a99a550e439e2d…

MALICIOUS

PDF

70.6 KB Created: 2021-03-11 16:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 839882c8456fa364d450681f4ab94788 SHA-1: 9e7a1f305ae83fc2d1542bdbb135e1cc4035a36e SHA-256: 71a99a550e439e2dc0ed68425767e053dec3137721ba6d088355ef3617d8f0bb
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further suggests a lure to download a payload.

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://kuzutuzo.ru/wix?keyword=the+manual+to+manhood PDF link annotation
    • http://item-mask.top/gabijusdmqdl.pdfIn PDF document text
    • http://br1.red/7575869729381q3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fda8f0f79541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5fc9fb498256e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5ff7590b6f243.pdfIn PDF document text
    • http://keksik24.ru/l_agriculture_urbaine_en_francegn54i.pdfIn PDF document text
    • http://familyit.pro/72556201264p358t.pdfIn PDF document text
    • http://zarabotok.space/wi-fi_sidejackingpf4xh.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/zopozogorol_kukozaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_603859b7b05e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5fe06169cc11b.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/fanurewawesitim.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/kidenez-wuzanoxekiva-kutusajadawoza-wididumuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_60405ee81ab54.pdfIn PDF document text
    • http://bloomwithdeanna.com/70523715647z9pt0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_6027ad88d312f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukajevo/hydro_quebec_report_power_outage.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/letter_e_activity_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/tahoe_rim_trail_guided_hikes.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_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 4740 bytes
SHA-256: dfa8c34d2e1bc0eb8762a06f11be314aee2974c97922b19505d186df1d941a1e
font_01_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 10656 bytes
SHA-256: 2c3b8b53e89e75395a157a39a8ac15b283c93df7687e83862e0c3bded2873b86

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