Malicious PDF — malware analysis report

Static analysis result for SHA-256 9543195d3459e11e…

MALICIOUS

PDF

73.4 KB Created: 2021-03-21 00:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b522268f97e657c400efcca4625e12c4 SHA-1: 024e4a5590cee88afadb7bce4164961f25b22d0f SHA-256: 9543195d3459e11efa0f12e7abc23401db16e93363c5cd403e49a15804ba1af2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'Assent form requirements' and the wkhtmltopdf tool, indicating a potential lure for users seeking specific forms or documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=assent+form+requirements PDF link annotation
    • http://levelupguild.com/mogumeld3td.pdfIn PDF document text
    • http://idealica-official-it.website/telugu_movies_list_2018ln0g6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455207/normal_600c000e25faa.pdfIn PDF document text
    • https://cdn.sqhk.co/rotusorukazi/Ys9gfNi/dante_virtual_soundcard_user_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_60110fa73e9ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_600024cb00516.pdfIn PDF document text
    • http://suzolovopu.iblogger.org/73749939500.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/ie9jcjg/cctv_camera_system_learning.pdfIn PDF document text
    • http://pelistens.xyz/fefilizafijury41.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/what_is_the_biblical_meaning_of_discernmentogrnq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_60185e935f335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bozolukiket.epizy.com/jaxijesi.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_b2652a9214b742d3b618ec0a36ae9055.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_d67407c4315340a19748430fb09f6453.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_7afd6161f7494b1f926703148974b599.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_20b5c689d4244affa742311671bcf465.pdf?index=trueIn PDF document text
    • http://tununik.epizy.com/95270115163.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_05d7114bb7d1473c972e9711ea090534.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 4784 bytes
SHA-256: d90c1d6c35d449745a7dc507592289c691add0df1911407e5e64ca80c8ccb9f2
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10572 bytes
SHA-256: c0bc2e3b6d508e6952b31122dcfef26b9c13babe9d38deb2b6ac86dacbca3ccf

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