Malicious PDF — malware analysis report

Static analysis result for SHA-256 4031009d1ef21e78…

MALICIOUS

PDF

75.1 KB Created: 2021-05-20 23:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0c90650d06dd84621930abd0f2b51649 SHA-1: 0f0e9af918e0e2188df7dbf15733ebf21a242ca2 SHA-256: 4031009d1ef21e78f5319c28446f087c66528ff7c9b6c7ed56eb7bda7b4252c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL pointing to a lure about obtaining a PayPal cash card, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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=how+to+get+the+paypal+cash+card PDF link annotation
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/deguja.pdfIn PDF document text
    • https://tuwozuzoleza.weebly.com/uploads/1/3/4/5/134509843/mogesuvopogiwa.pdfIn PDF document text
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/jodilaxosiz_mazavakawemadoz.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/dosalapasenow/bollym4u_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1344cb-8a36-4392-b300-58740215d85e/65009384728.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/properties_of_acids_bases_and_salts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaeb1da6-6def-47aa-b5ee-6a635312de6e/36304677838.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/35922629814.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/various_sustainability_reporting_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/monthly_rent_payment_receipt_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e02f15-2319-4586-a09b-3d4eacfbecf7/78398870591.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/59679743115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e71631c-3d16-44d1-acdc-6f5a084c1419/what_is_angel_number_805_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/nevupupaxataxulawezuto.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/weekly_meal_plan_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/master_plan_delhi_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d12ead-de37-4967-b429-def0a0db7dae/does_arbys_have_side_salads.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/87640292435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f633bc71-7fef-4b7a-8410-6eee217c8ced/10623597299.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/51075544891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5312c275-5963-4a9f-88a9-642e79d906d8/98692808587.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/27481898326.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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 5488 bytes
SHA-256: 5e2ee6d90bce8dbc560f58d3aed46be18d3d88502396e6f6f850bacf8d5aa7ce
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 9936 bytes
SHA-256: d577a1c455ec21502f9329f81b79f3acfb4963e002a095d899967a0976ac884e

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