Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dd1b6dbf2137c8…

MALICIOUS

PDF

76.5 KB Created: 2021-03-16 12:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8c1987db4e5b2c6f3144247287ada7b4 SHA-1: 29af10348210a54f4bcacbf9420f10e670b1a455 SHA-256: 17dd1b6dbf2137c85c0d596a492bb9f6eb7c12e95356538a41f6aff098641c5d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to suspicious domains, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=tax+amnesty+act+of+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480728/normal_601d545408dee.pdfIn PDF document text
    • http://xtrading.buzz/how_to_work_the_ninja_professional_blender6ja0l.pdfIn PDF document text
    • http://raisinslabs.club/ac_market_version2irme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_601d7cea5a029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_6029642fb99a3.pdfIn PDF document text
    • http://marketeuro.pro/97965161726sckbp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_6039ed8fd02a0.pdfIn PDF document text
    • http://meinekarten.best/challenge_video_bhojpuri_songi99hk.pdfIn PDF document text
    • http://discovljzg.fun/77153362354q46oq.pdfIn PDF document text
    • http://smirno.life/easy_veggie_indian_curryz3onf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_601f6c624fb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6015367c84869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_60479d0986462.pdfIn PDF document text
    • http://salonop.xyz/liluduju3bkub.pdfIn PDF document text
    • http://keepxufi.space/borokuselofuduratog0wnv.pdfIn PDF document text
    • http://winoorama.site/viking_warship_gaming_chair5blm4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_ce50435d939945579b665241adede586.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_0f09c0adfec843c68c6b9c1a2c5fcbfb.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_18baa752c6d04503815d6fdf4a269766.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_73224b19d15946a6a63389560029924f.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_9b62687f0ae34087b24f286b406ae6a5.pdf?index=trueIn PDF document text
    • https://f44f9643-67c8-4f42-8b6e-e794b3cce972.filesusr.com/ugd/607883_dac1dd613c3c4c0a930ecd1c98d55d9a.pdf?index=trueIn 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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 5564 bytes
SHA-256: 80cfd4da0f31ec7291897a5ab325132c914390853394b8b6a29adae9cf813b49
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 11392 bytes
SHA-256: a8ba37e168852fd41a383ea4921a43e5f917458553b6eb641f923065ed28f285

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