Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef110100b91d1450…

MALICIOUS

PDF

75.0 KB Created: 2020-12-20 22:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1843d7491fcc44330afd6e5d027be19f SHA-1: c8097f4a205bdabe469741e6c3b36aad389cf9ab SHA-256: ef110100b91d145043089c0905f04f4fd48fd4dbfb7d0f4c6ad990ee6d1b06a2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffking.ru/strik?utm_term=lenovo+thinkpad+x1+carbon%2528+6th+gen%2529 In PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/xewibosonobogop-wosodomekolavu-lupenomudop-vuvodol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5fcba0cc6fbfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce632e3-7ed2-4c8b-a34c-67a2fdaf06fd/who_is_my_dad_second_cousin_to_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33cacbc-22da-4fa9-bfb0-dc1288825af1/diffusion_and_osmosis_pre_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b37701a-f661-493d-b45d-e32d49674182/55162950427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f90acf-35b9-42a7-a88c-a532761a2975/85490413572.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5947b0b6b03258f5520ec/t/5fcfe7d41ce5cc3a1103d4d9/1607460828890/elemental_dungeon_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95a80f6-da66-4d0b-8064-f959c7e7222a/1.10.6_don_t_crash_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3188e1-88bd-4d6a-a9d1-ac933f27f79e/posilifexopadukar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cff81a-16fa-48dd-97de-a01f6d2f38bc/dejeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd89fbbb-558d-419d-87d8-7f26bcab8e6c/24764238281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46afe994-98cf-4282-839f-584b3c58e9f7/52460035177.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d452bda9c57a97d752dd/t/5fccbb5924c49707d31c59d0/1607252826010/highway_550_colorado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80a9958-d873-4493-bbf0-60a28aa910b8/infinite_atonement.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_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 5756 bytes
SHA-256: ff303428b1e0b68ea89613fdc56dae9881c8c9ba25b8cd0e3e755679abe0b217
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 11232 bytes
SHA-256: c565d778bae561ba1be3fd3cafbfaba83ff139d5c2b18dae95c0cdbe55c8535d

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