Malicious PDF — malware analysis report

Static analysis result for SHA-256 212448b242545156…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 12:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 92f6c2ac1705a9298772f62f771eabab SHA-1: f479ba19fcbc569c80e55e4b2e41f0df2accfd63 SHA-256: 212448b242545156131c9d19d2290fb97bb06d91ab50a9581a2cfb0087e19fcd
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable hosting services, indicating it is part of a link farm designed to drive traffic. The primary URL, https://mezovuduw.ru/award?keyword=perforation+digestive+pdf, suggests a lure related to document content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=perforation+digestive+pdf PDF link annotation
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/pipuzij.pdfIn PDF document text
    • https://bevalapiwilidi.weebly.com/uploads/1/3/4/5/134587476/dd06fa6.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/cgdhjhW/revuvivapigeba.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/hbggiie/wagul.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/jgZ0Rjc/99155561841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9dc9da-e480-481d-9b2f-96d059dae7a6/letovosajinobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9418f147-3912-4c7a-89a0-37dbb11ebb2b/54631466631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a219ad-b09e-4337-96a1-ceeb82c891f1/briggs_and_stratton_450e_series_148cc_manual.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_5e7ec1c97d204acdabf7f0e6ef22b1ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ea3d50-ccfd-4792-bea5-1544889be2d8/i.t_jobs_in_ghana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453e0a14-89a8-49e9-a3db-7feb1ab513d1/sokonupavix.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_5d939b59d06d442fa34068e1d5044d2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4816b7-deb7-42a2-b564-3ce31293ca50/the_communication_age_connecting_and_engaging_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cb4459-6437-481d-929d-9d84c83fb244/wusuxabator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a2ca27-2a3c-4b1a-b265-5dd4a36bfe31/fosenekiked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec39681f-2a25-4693-ae24-3fd7d85b3f94/jesidixulajatiwofuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ad019d-cb56-4a85-9e6f-f6f0d598411d/boroleguwofosesakiwut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abc97ad-0159-4cef-816f-cb2a56c5f5b7/garmin_920xt_hrm_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3dbe9c-7bd2-426c-ae75-fc2a1946f7fe/john_deere_d140_wheel_parts.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_31770c4827a846e9865224f3a4bf626b.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_447709d4bd8b4913b49a07c80e9e495e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d53857-7919-4d09-b848-07419f8273fa/quadrafire_1200_pellet_stove_manual.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5240 bytes
SHA-256: 7b1720c86d2a2c4007d8a6e8ecacd1a3aafbe145a81e4760d75eb4a4bcb9581f
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10940 bytes
SHA-256: 06f8e9802cd5294476e07e5b9d6e0f6f81add56ccbda98aa043413f5b9163343

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