Malicious PDF — malware analysis report

Static analysis result for SHA-256 50264e2d2f8cb971…

MALICIOUS

PDF

66.4 KB Created: 2020-11-24 06:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 13b3d4bebb7ba758df79d50e22ff19d8 SHA-1: 9176932ff23dec8886b80618afc59bf2b78651c3 SHA-256: 50264e2d2f8cb9710674fc195c8285dc08c8ee28d284d2078550cd254fb9abd6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links embedded within it. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/123?utm_term=composite+functions+worksheet+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fada312d64ec.pdfIn PDF document text
    • https://bomevalaruzaf.weebly.com/uploads/1/3/4/8/134871705/borisisixovev-sitenetafal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f97e5ba3cbc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fa3d3625dab8.pdfIn PDF document text
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/4626069.pdfIn PDF document text
    • https://zopavuro.weebly.com/uploads/1/3/4/5/134584556/lurovuvofor-zumiruwowij.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/jedaxopopuko/20122928336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9d85b4-bb07-4d69-90b4-813e3990c6b9/mebagegop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d26de6-7114-41ea-8996-2306b0204ac5/introduction_to_computer_security_go.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f639628-a3f8-47c2-9c5c-cc5adafd6edf/fagidadororam.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/quantitative_data_analysis_treiman.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/angry_neighbor_beta_10._0.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/leranofopejagomowilojenem.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_off0000c2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 5284 bytes
SHA-256: dd13e44d9619e56b67bd2cb06359a8993501adc399158c8cec368174612f2d76
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 11212 bytes
SHA-256: 3cdc8b8b05167262bd3c0ad7df8d1989985fd1317b759d52e5d7f93febdf1e7d

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