Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cb9ae07a40fdb2…

MALICIOUS

PDF

94.1 KB Created: 2021-03-17 17:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5e8d42b69db3e0da9bc8f5a49ed8a8ae SHA-1: ad405a031f409458a711069fbb8ce3bb51dad0a5 SHA-256: c3cb9ae07a40fdb24adefe32e34281b8de11ce213e025abefd0907682f8b22bf
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, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to lure users to external sites.

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://nipisod.ru/wix?keyword=hubspot+inbound+marketing+certification+answers+2019+pdf PDF link annotation
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/fujonutiji.pdfIn PDF document text
    • http://yourlivehelp.com/20782570074wi9zp.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/JMhaEQO/47492239279.pdfIn PDF document text
    • http://help-bluebadgecenter.com/pixetokufujipewumepudloth5.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/romipixilijuga-lazenipugewute-tanorep-kofaxetefi.pdfIn PDF document text
    • http://creditreportus.info/ets_gre_practice_test_redditehq9z.pdfIn PDF document text
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/9040912.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/lepizo.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/hajagc4/brand_management_job_responsibilities.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/degenosi.pdfIn PDF document text
    • https://vujalonekodi.weebly.com/uploads/1/3/2/7/132712286/8601174.pdfIn PDF document text
    • http://j3vnci4.xyz/boy_scout_shop_houston_txdhs26.pdfIn PDF document text
    • https://gudabujazoz.weebly.com/uploads/1/3/0/7/130739385/366015d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesekerezox.epizy.com/acronis_true_image_2020_iso.pdfIn PDF document text
    • http://gowokuvatudo.rf.gd/25723199554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a523524-506a-4a24-afd6-9774769147cd/jesazifodejamowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655dcdc1-c18b-42e1-bb2a-e8eef640e040/everstar_portable_air_conditioner_window_vent_kit.pdfIn PDF document text
    • http://soxenaroguz.rf.gd/19487290171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31677fcd-94ff-44bf-b262-b34e34787767/wilunowubezidozitoluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3570a2c9-bf08-4b1d-bca3-cac5767e3de5/el_pollo_loco_menu_chicken_wrap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c564a75-2d82-47c2-a000-bc3599c0b951/8693864241.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_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 6184 bytes
SHA-256: a7326e970df715fee4b7093268c6d550ab0d7056f297702da3929019c1a20ec0
font_01_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 10968 bytes
SHA-256: 628969e3bfd8a4bb8e68227c5cb119ef34d76e3babda3135a2985e4756e57a0b

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