Malicious PDF — malware analysis report

Static analysis result for SHA-256 984cf38b1565875d…

MALICIOUS

PDF

78.1 KB Created: 2021-04-17 12:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7133cb51072326d9503fd2232d2f85e4 SHA-1: 255fdb049836c6b3963e59666bc64e059128c93c SHA-256: 984cf38b1565875da92fd6206769120e32024c76f12ce553812e067fbc230b64
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/strik?utm_term=wheel+of+time+castles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_60620f3ce7b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_6063ec507d43e.pdfIn PDF document text
    • https://cdn.sqhk.co/nisonodoweb/gaSBLpg/topaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_606a6522dfba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_602aefe470f0d.pdfIn PDF document text
    • http://sifulodidikit.22web.org/gatoxowekelos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_605957c514a90.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/w5Cheji/treasure_hunters_book_1_characters.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/6996714.pdfIn PDF document text
    • https://melenoradu.weebly.com/uploads/1/3/4/3/134340649/nitositagad_lelitis_tawalo.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/xexaxejupu.pdfIn PDF document text
    • http://fevalugumaj.22web.org/hand_lettering_practice_book.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hfMJ6dF/33562897137.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/idIgdjf/69382650298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relamelekubapan.epizy.com/1950_marlin_336a_value.pdfIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_3dfd1a4e25934cffb3260bc0fbf818f6.pdf?index=trueIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_594e9b8083db4c14a36e27f9b9c45b82.pdf?index=trueIn PDF document text
    • http://pugaperis.rf.gd/pathfinder_roleplaying_game_bestiary_6.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_737b229f4557444ea75426669f6cf916.pdf?index=trueIn 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_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 5036 bytes
SHA-256: c4645a74dc1ee6d18631900791c9494c9b95b7bcc67f1862556e598de4162e25
font_01_sfnt_off00010581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10581 11116 bytes
SHA-256: c33a0742364295314d2406d556633d0d4c0a12c6602b68da6e7552062255c0eb

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