Malicious PDF — malware analysis report

Static analysis result for SHA-256 523d8c34750e51c4…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 12:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c79314a072a389d3aa925e36cab95e SHA-1: 5db5ed9ef26ea6eaa94a7ccefc4870395cda7f14 SHA-256: 523d8c34750e51c465fca958ef014d892ff3f1bb7ca3ff9d1c1ffec4d105b06b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The primary malicious URL is presented in a context that suggests a search result lure. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=craftsman+weed+eater+17+25cc+parts
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5ffdfeb466aac.pdf
    • http://weroserigo.22web.org/cs_lewis_the_screwtape_letters.pdf
    • https://cdn-cms.f-static.net/uploads/4490917/normal_604ecc7916b65.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_6038fa11a0d68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_bce9f53979124091a16e424cceaf20ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edc81a33-1957-49c7-bcaf-bb175c48faa0/define_human_factors_in_healthcare.pdf
    • https://uploads.strikinglycdn.com/files/b94e7a90-5a0d-4c1b-baf4-7c4db7b1b429/the_philosophy_of_time_travel.pdf
    • https://uploads.strikinglycdn.com/files/aa3e2b36-390d-4b92-89b2-331734775b9b/how_to_pair_a_microsoft_designer_bluetooth_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/f9acc951-c9a5-4f43-acc1-db0b2de102bc/supersonic_remote_code_search.pdf
    • https://uploads.strikinglycdn.com/files/21f4b631-2451-4420-a286-4b97292db716/13867439570.pdf
    • http://xupiwepe.epizy.com/fastq_files_from_basespace.pdf
    • https://uploads.strikinglycdn.com/files/c218753f-ef63-4b3c-bb9e-41ed4badcfbb/operating_system_concepts_by_silberschatz_galvin_gagne_9th_edition_download.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_bb95b3d46a704b9b82ea757775589bcf.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_a85773748f6b4723bfd1615f5a9cf0b7.pdf?index=true
    • http://mitudosukekunif.epizy.com/histria_do_brasil_nao_lilia_moritz_schwarcz.pdf
    • https://uploads.strikinglycdn.com/files/29804052-8ae2-4cb4-a9ee-b13e7655a455/kisel.pdf
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_5c5f2cbf09214e89bf9b54ce32404622.pdf?index=true
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_27c13980ac21453887a01d5360c7913e.pdf?index=true
    • http://lusuzajemofim.rf.gd/dadefekadaz.pdf
    • https://uploads.strikinglycdn.com/files/6b614e3c-28a9-4c3e-b0f6-20798610c132/88802653973.pdf
    • https://uploads.strikinglycdn.com/files/01bd53ca-2a9a-483e-9e88-354d72b9e7d9/bajofupanudax.pdf
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_24e3d7e94cc8482c964448b86a9fab92.pdf?index=true
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_a6437eda4cd8453f87b5820acc3b5dd7.pdf?index=true
    • http://midotujeg.rf.gd/nueva_reforma_educativa_2016.pdf
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_fae77995122942b88614a97a95f0c954.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ff.bin
2de7517e21749fa8bffbb7350b1a6c0f73ea22a9deb26e0e949d19d98f2ee425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 5656 bytes
font_01_sfnt_off00010550.bin
5983f273ce09ca5e389df8c079ee86e97d9916b8eef1f4eb0ccb98bb9cecd99c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 11028 bytes

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