Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb82a20e1963fbb…

MALICIOUS

PDF

120.5 KB Created: 2021-01-01 14:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 239ffefa41ecab7946b6543e7eacbe91 SHA-1: dff74e8588a460ee41501e471444bbd881672ec3 SHA-256: fcb82a20e1963fbbaad5305362fb4613aa0c1ac25a6f8029d7ded0c5132cb959
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with critical heuristics identifying it as a malicious redirector and part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://gettraff.ru/aws?utm_term=affinity+photo+manual+espa%25C3%25B1ol+pdf', are likely used to funnel victims to phishing pages or download further malware. No scripts were extracted, but the PDF structure itself is weaponized for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=affinity+photo+manual+espa%25C3%25B1ol+pdf In PDF document text
    • https://xokapajutubesa.weebly.com/uploads/1/3/4/7/134730315/6f6b222d1ce2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_5fa208ad0c379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb61d382743.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/8286166.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvetaso/35830377077.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/21933229111.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/braveheart_movie_background_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1f72ef-6e69-4e0d-9774-f5f5c9b95fea/return_man_3_unblocked_at_school.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/employee_non_disclosure_agreement_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/zojumuzobodi.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/pipagugagamujetoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/free_cryptic_flower_quizzes_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/63835911289.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/gerodawoxuvekedutuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/arithmetic_sequence_and_series_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/apa_citation_report_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C52 2224 bytes
SHA-256: 2575e28503995634cf2114a2f1abc247ea7f0cba7c2d20880e9bbb693cd3c71b
font_01_sfnt_off00019688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19688 5488 bytes
SHA-256: ca788844bbfcc2aba2ea90e2d099573f4632436dea3bff60e73c42fcaa8eece9
font_02_sfnt_off0001a8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8D9 11976 bytes
SHA-256: cae671ddf7a449ad718bf301de05d993ff448c5f27455303f5c5fbe6eef4f11c

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