Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2ea9256fbce47c…

MALICIOUS

PDF

194.3 KB Created: 2021-03-03 03:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9b9264a43f51b93a33e6adc7b35658a0 SHA-1: d95d0a4f59bb27db416150b0993f85f3b4fb7491 SHA-256: 3b2ea9256fbce47c87482f7108c9b2457977de8e8b1aa810f3146b50aad106b4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=color+a+course+in+mastering+the+art+of+mixing+colors+by+betty+edwards PDF link annotation
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/2311483.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/gVoOjdK/47715476269.pdfIn PDF document text
    • https://lenumerizak.weebly.com/uploads/1/3/5/9/135962539/pudozunabugodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5fdd075c1eafb.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/1753671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5ff001d13e169.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/idgijdj/3281069344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_60134cce1a119.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/california_lease_agreement_template_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fe9ca3bacaa1.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/jcfAQji/94010450613.pdfIn PDF document text
    • https://cdn.sqhk.co/xogeloke/hi4ILwW/ball_pipes_game.pdfIn PDF document text
    • https://kedosesu.weebly.com/uploads/1/3/4/8/134853013/5163168.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/fitobilize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_602c81b7405ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002a987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A987 5740 bytes
SHA-256: 81a4131c1a957fc2be805961c945fdd460c0466276c37dcfaf9fa9507b1d66d5
font_01_sfnt_off0002bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCF4 11948 bytes
SHA-256: 01ffda30fa241a943e57ecae449bc8ca175f98a8398ff79581d2e136f67a27e4
font_02_sfnt_off0002e51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E51A 16120 bytes
SHA-256: 73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75

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