Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6c9a2c98dd602d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 23:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fcbff296be8a9ef7dfaa03ee8d85da26 SHA-1: 30db24e281f7787fd730cde757f6e74043a73df4 SHA-256: 2b6c9a2c98dd602ddd6eff4fe9c0010c8550dc0e428ceec9131b1b95ccc754d7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of external URIs suggests an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=chemistry+key+words PDF link annotation
    • http://activa-fb.com/427185594207fqwx.pdfIn PDF document text
    • http://naturfresh.space/dafuvajadovigomy60a.pdfIn PDF document text
    • http://covidcapsule.world/71608686966yik2s.pdfIn PDF document text
    • http://shop-profildoors.ru/tixorafunixunisaviwapiv3j5gk.pdfIn PDF document text
    • http://vkysnaya-eda.site/technical_drawing_symbols_weldingv31w1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_602661772a080.pdfIn PDF document text
    • http://zesamoa.online/47390999853t4bvc.pdfIn PDF document text
    • http://youralteragoods.com/what_are_the_5_examples_of_operating_systemvkbu6.pdfIn PDF document text
    • http://bestrongbyg.com/72231160639yode8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_60053ffdad9ea.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/midizaxopazeji/49938657490.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/19406937880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f308ff-f3fe-47ab-866f-18ce3a7522dc/husky_air_compressor_oil_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ddfc84-12fd-4031-85cd-09c337361d52/what_is_the_meaning_of_curriculum_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73698e2-5911-4975-a372-d9e0773b4b91/69115903051.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/tutorials_for_java_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e675751e-ae7d-42b4-a4b0-e1346dec104d/area_of_shaded_region_circle_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e43c30c-7fcd-4094-b506-358982da52ba/how_to_reset_i500_tws_airpods.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/where_is_the_fashion_report_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f11dab9-002a-444e-8ee8-aac1fec9eb7d/98669366452.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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 4984 bytes
SHA-256: a317e7d52e83396587da78f5f9e2402c2f172f01a54684337277dd682ca5815d
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10388 bytes
SHA-256: 35c8fa91bdbfaba164b9f59b34e3f328eff1d674e6808ffbe9ed12c85540b355

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