Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4c18aea22879d5…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 18:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a04761bb6fe11ca380d927d86958575d SHA-1: bc6f594ee74d589770055a73bce2e8da4091366d SHA-256: ec4c18aea22879d512bc0d95ab2c928b0804e2966fe1a4be96e696a0e81d1784
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure ('Fish themed bed sheets'). The presence of multiple links on disposable hosting and the ML classifier's high confidence score further support a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=fish+themed+bed+sheets In PDF document text
    • http://tekplafond.xyz/segofugewelere6793x.pdfIn PDF document text
    • http://livethailand.fun/bazudikovikamasewial8on.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/ragotezagizakexg0qn.pdfIn PDF document text
    • http://3-bureaureport.info/85377986014ege4g.pdfIn PDF document text
    • http://laithub.pro/balupaginovuxizatirojewh1dzv.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/farefasejikap/69473938582.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_fe4f248e4c784f279d5f642ccfb20382.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_65525c42325e41b1a13f44fce2f89c68.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_d7086b8d22924cfe85ad3ac8c84abdf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6edadb-9072-4f9d-b28c-7571f596a3fb/63320568330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f39966-bbd1-4448-b975-6c4fa6277bb5/50779014545.pdfIn PDF document text
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_7d7c7bc5235f433fb5414d4e1be1c0e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/internet_video_er_ios_app.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/zasib.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_1c0a6bf0824a42ccaa8af7abf2563d97.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_6d4879d08adc4eb3a427b92d6c2a1de1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc79679-5ee8-4595-ba11-00c16f73a491/angelic_sigils_keys_and_calls_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 3416 bytes
SHA-256: 9bd8b25e9e9dfabd964ebe0ff40a0ea4106c368da821e345a20a0bf379df7385
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 4820 bytes
SHA-256: e0210cb33a6c71de1a7568b95f9f0f030e56d0c2ac916993f25d5ec1f37328fa
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 10284 bytes
SHA-256: ed0fbad2cc45a941cbe46ced23fc227f5968dd632da52cf56cff567b38ee1be3

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