Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436ff757b6fbcbb…

MALICIOUS

PDF

76.0 KB Created: 2021-03-11 09:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f7f5fc52866117666f00e11dba9f768e SHA-1: bd7f2ebed642f4662b04711f44ab0d9ad50a1c68 SHA-256: 2436ff757b6fbcbb0d71ea8b18b256384aaa0a6039cedafab89de89b6eb709c1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic to potentially malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/award?keyword=isometric+abs+pdf In PDF document text
    • http://xuxetosufuzo.getenjoyment.net/saram.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/50771082044.pdfIn PDF document text
    • http://rowefuzoj.mygamesonline.org/xurageka.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/didowugorokirug/40076641856.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/nudov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2b07d9-45d7-40e9-881e-d7645b6a91ef/21285092139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4471717-8c3b-4f57-9836-f3d66f87418c/guponejekov.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_6778c26b1c0249a9b0c299553f4fa385.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/restaurants_near_kennedy_center_performing_arts.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_661d0daea78348a7b83ed8d2c941a7d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9658cc0a-5862-41a2-866f-afb299f07ed7/vince_gironda_diet_steak_and_eggs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f825ce53-b705-4ef2-ad76-2f853904cd06/tufuxasenedimusix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a645bc-a42b-4beb-8335-460542cf5ec9/westinghouse_rmt-05_remote_control.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_1744c425202446c584d405cc11020aa0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bae7d42-1532-48f1-8eb9-35c9d8993282/ged_math_sample_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61ab4b9-deb2-4ad8-b898-d94a86d8bd4b/how_do_i_restore_my_samsung_tablet_to_factory_settings.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_95046619a40b46eebba67adce0401b86.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_cf0a07ad962a45c9b19fd7a0fbbd707a.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_a919409aef67462e910319f7493b88f0.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_9c47a7a75aee4658b396bf137c23ac83.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_d479017214a64e4cab3429cd87d2a20f.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_447a5c8a96654e7ca58c49ff186f9d65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf85715-69e5-49cd-a296-d9cd3f8b3e97/navy_evaluation_and_fitrep_writing_guide.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_d4c68134b1fa41c1bc404e61799349a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/98002780611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30a79f0-0386-488b-9395-3a9d8de1fb46/how_to_hard_reset_kindle_4.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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 5344 bytes
SHA-256: 5de27ba85eadbff83e600f531f6b6006ee51083263bd75d7fbb006147d2f951e
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10184 bytes
SHA-256: d53cbe72e94f3fddbb20f9b341ed57cb7c46ca1c341c9ca67bca4240d3f66d85