Malicious PDF — malware analysis report

Static analysis result for SHA-256 a005ecfc49cd0d50…

MALICIOUS

PDF

91.2 KB Created: 2021-03-25 15:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4c28e2547acbed4fe5a0f8b9de7578a6 SHA-1: 8a08334166e924e395136131c84ac7c6f7accab8 SHA-256: a005ecfc49cd0d5011660428fa6d8f6f20fe32b061ebfeedeeaff8479317c296
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. It contains multiple embedded URLs pointing to external sites, suggesting an attempt to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to facilitate access to these external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=thermodynamics+crossword+puzzle+answers PDF link annotation
    • http://xemokajoled.medianewsonline.com/8591265578.pdfIn PDF document text
    • http://xofawewojego.22web.org/23525497774.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/69101341935.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/85413502735.pdfIn PDF document text
    • http://xufegabuxugil.iblogger.org/minority_report_book_ending.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/frigidaire_refrigerator_fgus2632le0_parts_list.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/awaken_the_giant_within_in_urdu_free_download.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/4893435715.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/VjfjcaJ/waybill_excel_format.pdfIn PDF document text
    • http://situbune.iblogger.org/kizuzatobixifulibozelik.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/3d_exporter_for_rhino.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/Chfhjje/sword_art_online_alicization_wallpaper_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dagoroj.rf.gd/70135459946.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_356e96fcfb70455ab3be84be68208b09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83853bd8-fd03-458f-bbee-97a9d9be9ba6/tage_frid_teaches_woodworking_download.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_6247ee7adcb44d8dbf3b14d52ff80397.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f58604-447c-4f3c-a467-4e6cf48b9683/gimoperewiza.pdfIn PDF document text
    • http://koxosam.rf.gd/motagafevolumavuxidagabef.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_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 5508 bytes
SHA-256: 91e94a7ac09f5b3e214d7115721ab73f62f604a69bb8907d707aa8d3028cbc37
font_01_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 12100 bytes
SHA-256: e19561b05bf0f3d369e17b79c4d2d9d7dea0384c6c7e60796c8b49a6d5fcd7e3

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