Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07649b54cb71ffb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 03:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: df0191ad02154a022c94fe42e3579000 SHA-1: ee3dad23aa8c2c7064994388f0498d0f8814aa04 SHA-256: d07649b54cb71ffb4426bd1f29e61b131b029844d83b1da02a14066b7f875a43
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be related to legal definitions, likely a lure to drive traffic to the malicious URLs. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=what+is+a+testatrix+legal+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fd6370d21f5b.pdfIn PDF document text
    • http://dadefuxafovub.22web.org/20876837549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_6019a5dc8fa16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5fed98d847387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fd5f4118c6e5.pdfIn PDF document text
    • http://price-list.moscow/how_tall_do_ceilings_need_to_be_for_coffered_ceilingjda5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ff3f496017fb.pdfIn PDF document text
    • http://idealica-italy.site/rune_magic_5e_storm_kings_thunderabowc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_deba20bd99f54e6f863c4a078c6f0d75.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_98c964597aa34d9c8342b75c37017923.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_1517d9b3b0474884a11ecb796c2d3738.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_6ac1b9c6ef9d44c19a54a92ad2fe5086.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d1d233-84fb-4b6c-95ce-0c581b09053c/fuxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd3e2ef-c15e-44ee-beb3-558bef84dec1/samsung_remote_control_bn59_replacement.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_9b307aeb3c08462e9649bc8d882ba636.pdf?index=trueIn PDF document text
    • http://tobobuximalusu.epizy.com/buick_encore_2017_user_manual.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_bae605f8f28347dda97d4032522933b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74aab762-106d-4575-9f26-3ecc7dea4ae1/can_i_use_metal_tray_in_convection_microwave.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_4b826a2945d6403e85e9e4b36a034044.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_cdeacb5b90a1444d9ff5e8fe775a83e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27eda155-5972-4a13-9cbc-f90a783ed344/friedberg_linear_algebra_solutions.pdfIn PDF document text
    • https://f33eab34-52c4-4f1b-91c9-7c5ec1255b8f.filesusr.com/ugd/9d0374_1f7c1f6ef86b48b8907970aedc5ec084.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/672369c7-7f1c-40e2-ad60-03180dc06cf6/xupirurusizajo.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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 5248 bytes
SHA-256: 2254b7ccb95e2136737fb0205181deb5907faab8036a804b437b4eead45afd38
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 11876 bytes
SHA-256: b5ac42c4e98317791f3136793d5daa6957ab2ce169ffcb0b79f1216f8d977500

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