Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c303b21d3cc607…

MALICIOUS

PDF

75.5 KB Created: 2021-06-04 12:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cc9134e43093ee0b5f0631032977434d SHA-1: 5aa828ae525d951e2ef6326886c5c7f4addfe75e SHA-256: c4c303b21d3cc6070ed18d85905ddfdf3ad043190a9921b862e0a3574fad203b
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. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://static.s123-cdn-static.com/uploads/4373768/normal_5ffa31a496a78.pdf In PDF document text
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/xovofisevexe.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/xupisifimes.pdfIn PDF document text
    • https://tokunebejuz.weebly.com/uploads/1/3/4/3/134323577/fef24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410211/normal_5feebc951fb8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_6027debc30248.pdfIn PDF document text
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/1145416.pdfIn PDF document text
    • https://gebopudexor.weebly.com/uploads/1/3/4/4/134482947/7419b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_5fc80adaa1c22.pdfIn PDF document text
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/8412487.pdfIn PDF document text
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/xagadejere-mirijabimok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_604f5deeb6ba5.pdfIn PDF document text
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/22b902.pdfIn PDF document text
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/bovavog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60247024e8c68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_6002b7970fa6a.pdfIn PDF document text
    • https://synerhu.ru/pbw?utm_term=%25D1%2581%25D1%2583%25D0%25BD%25D1%258C+%25D1%2586%25D0%25B7%25D1%258B+%25D0%25B8%25D1%2581%25D0%25BA%25D1%2583%25D1%2581%25D1%2581%25D1%2582%25D0%25B2%25D0%25BE+%25D0%25B2%25D0%25BE%25D0%25B9%25D0%25BD%25D1%258B+%25D0%25B0%25D1%2583%25D0%25B4%25D0%25B8%25D0%25BE%25D0%25BA%25D0%25BD%25D0%25B8%25D0%25B3%25D0%25B0+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25B1%25D0%25B5%25D1%2581%25D0%25BF%25D0%25BB%25D0%25B0%25D1%2582%25D0%25BD%25D0%25BEIn PDF document text
    • https://synerhu.ru/pbw?utm_term=%25D1%2581%25D1%2583%25D0%25BD%25D1%258C+%25D1%2586%25D0%25B7%25D1%258B+%25D0%25B8%25D1%2581%25D0%25BA%25D1%2583%25D1%2581%25D1%2581%25D1%2582%25D0%25B2%25D0%25BE+%25D0%25B2%25D0%25BE%25D0%25B9%25D0%25BD%25D1%258B+%25D0%25B0%25D1%2583%25D0%25B4%25D0%25B8%25D0%25BE%25D0%25BA%25D0%25BD%25D0%25B8%25D0%25B3%25D0%25B0+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4862d357-ddbc-41db-8742-578d4eb4b0b4/hayward_salt_cell_cleaning_base.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/how_to_reboot_ring_pro.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/kung_fu_panda_3_full_movie_in_hindi_download_300_mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f191dbe-9699-4298-b520-675da84c338d/how_many_times_to_perform_epley_maneuver.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144506550/hp_t2500_service_manual.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/instagram_followers_app_download_ios.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 6524 bytes
SHA-256: 864ef85a3bd22fa99e05361a0ce782eecef108e6f8dfbdd83f5aefeb9d2fc0b8
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 14232 bytes
SHA-256: 9f482aeae76fcf2ae628dfe8b2d46aee1040605d0fa258c52044afd81224c28c

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