Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f896e905f5949b…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 00:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7b61c7698dccc5244eb580efc639636 SHA-1: cb75f3693f6d5df3346bb4c51a4196ab02d0ea90 SHA-256: 76f896e905f5949b08dc6b82a440b98b9848a4dc7e1f22f25c542ec9aaba8586
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains multiple embedded URLs and a heuristic firing for a malicious redirector link, indicating it's designed to lead users to malware. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. The ClamAV detection and ML classifier output strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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/strik?utm_term=hp+laserjet+1100+driver+windows+7+64+bit+free+download In PDF document text
    • http://dovulup.iblogger.org/36473667821.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/fjgjcgh/71393952293.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/9bShbHJ/dagolad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fda62c875128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5ff1b99327db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fdab9064d470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5fcf36c2641e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/mheSih1/sheltered_definition_simple.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/direnagoketim.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/ifTgfhe/76757725141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff65deb52d67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5fda00b3bce09.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/950ea85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_6023f22d04806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5ff1f95b5506e.pdfIn PDF document text
    • https://kibepujuvug.weebly.com/uploads/1/3/4/6/134644113/6582ed228e1bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negavutagogo.epizy.com/95487353788.pdfIn PDF document text
    • http://ravimerafewede.epizy.com/aligarh_muslim_university_form_for_class_9.pdfIn PDF document text
    • http://gazisuwak.rf.gd/android_apps_on_windows_10_mobile.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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 5880 bytes
SHA-256: 5fd31801a78bfe5f37dce20cb50d5a49a432c27af74c17ffe2a9ce5c25c28853
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10252 bytes
SHA-256: 76534b9a053571efb41d30b5f1c088face984faf74b822526a35b962ccc12912

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