Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e21256d51b15b59…

MALICIOUS

PDF

70.6 KB Created: 2021-02-17 23:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11b707e4c5a68d9acbf04ffaa770d3fa SHA-1: 0be13fd6df4f29295570b3ec52f91dc629d62141 SHA-256: 8e21256d51b15b59c09fe85aa78d8e41f48908622cb263dff3cc1800cf621419
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=economics+budget+project PDF link annotation
    • http://it50disconto.pro/blazing_bagels_nutrition_information7jin3.pdfIn PDF document text
    • http://momentshop.website/reading_skills_exercisesx77r5.pdfIn PDF document text
    • http://women-ita.space/payrange_mobile_app9q7ua.pdfIn PDF document text
    • http://onatural.space/140867768648lvys.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/3809204.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/c0diiw5/28446908953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce47863f94c.pdfIn PDF document text
    • http://opsnatur.fun/practical_skills_in_chemistry_3rd_editionium6g.pdfIn PDF document text
    • https://ruwawakutiro.weebly.com/uploads/1/3/0/8/130874672/zobaviladififugoman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadokeg.epizy.com/author_s_purpose_worksheets_for_1st_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/cra_canada_ei_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/letter_sounds_prek_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/97080134624.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/6900476783.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 5324 bytes
SHA-256: 8109ce97109921d65d701aed4ede3b5d93fa1a2f558f49104f4cd96d09b15893
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10128 bytes
SHA-256: a1656282d624b80f6d400e38702789eea118d197b64606ed8952c0b9f511f2b8

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