Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e5afe938c7252f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 15:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: da9ba82c03a21ba6d77390ffa0315cd5 SHA-1: 97364660c4ee640c86d6c95ac3cba8bedf2a0c60 SHA-256: f2e5afe938c7252f26a18d316a8e88c9961e77c391546e386eecf9671ddcd581
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a suspicious URL related to finance research, and a heuristic identified a mass external PDF link farm. ClamAV and an ML classifier also flagged the file as malicious phishing content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or spam-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=which+is+the+best+topic+in+finance+for+research PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5ff4a1d230690.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/fezikamajesakaxoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fe714f51c540.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/tufapimibujo.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_do_car_engines_work_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_60278a175ed55.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/jasipefulaxiduj/denon_avr-1312_replacement_remote.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_d7dd5f041ebf448daf93564b7e83464d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/happily_ever_after_kiera_cass_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0b3588-c57e-4014-a584-cbe54a34cca1/when_was_the_wise_mans_fear_release.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_a63b19df59a34792b7d8c00b1c2ca396.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/lacoste_polo_fitting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f63611-a2f9-436a-8a1a-521eb778d3e0/huebsch_top_load_washer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/71209462602.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/birolerimikexatoduto.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/ntn_flange_bearing_catalog.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_768b3e1f4e1b4b139c426ef8934a5880.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2e2be8-0f99-47ec-814b-32a5871eed24/57495256929.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/jigivuvopoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/nunoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a2c02b-91da-4305-910b-15157f6b07b8/icd_10_code_for_compression_fracture_third_lumbar_vertebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e739e7da-d3b3-4484-8510-0336961bdbbb/zidejinimedifuze.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/51228125360.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_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 5224 bytes
SHA-256: f5a5ce610c14de3cf4f1f5209ee659db7f94c2cf483c593c4c9026fe777088fa
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 10664 bytes
SHA-256: 4519489390b2552a483e340155e861f6b4b8d4c63ec076c291bd4baafebbcd16

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