Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2975da7b80d4b86…

MALICIOUS

PDF

79.5 KB Created: 2021-05-16 15:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e17f9d3b03ecbd5d3b68c5391e2d3128 SHA-1: afd08e2090caae531659a8c35105461b7cfdab87 SHA-256: b2975da7b80d4b86e52bccb8c74f932c13fe8ec94a59d48bdb0477524c2f4314
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=scholastic+reading+level+chart+pdf PDF link annotation
    • http://medebupima.sportsontheweb.net/academic_writing_task_2.pdfIn PDF document text
    • http://molotkov.site/548098748295gii2.pdfIn PDF document text
    • http://femaxewife.getenjoyment.net/18886389795.pdfIn PDF document text
    • http://oneshops.space/83142576863gijy9.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/what_do_social_workers_do_in_foster_care.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/fijonezozemuwowax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_058eb8e1765c47648f0ef413c1414760.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_707d16502650463cbecd83c4a46ca25f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/betojogidaguzewafewiwafap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad04b43-9af9-464f-8434-f7ce28b14b52/what_jobs_can_sociology_majors_get.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_d603d9b1c56d4cbda1a8432c97eccb66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6111dfc3-11ca-4414-b1da-0074e6189959/how_to_replace_batteries_in_fire_tv_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/what_is_the_shape_of_clf3.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/lumurifimisa.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_41cd47e6432041bc9d413f67a613b845.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/weekly_office_cleaning_schedule_template_excel.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_b108e0f270a64086b32f4b20f86b0fcf.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_563b6bae3bf04518b7cb321c50ac6534.pdf?index=trueIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_a4670590fa0e4050912a6608978442c1.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_26419aaff447408a9fe85c8ac72fa5ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33302787-508f-4f78-9ce9-1136a4db30ee/define_progressive_education.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_aa867164c8884c749507c70888f38231.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_f75917079b354cdfa86e4eb73fb87d64.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_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 5580 bytes
SHA-256: 8e831a86ae737e261977d7dfe525634ea03d6d56a5abccd6be65d057b4756ec6
font_01_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 10960 bytes
SHA-256: 8d8253e75f99b99105ce0739b1350623c8243bc231b306ba669914dc2e9937d2