Malicious PDF — malware analysis report

Static analysis result for SHA-256 73878d77438ac459…

MALICIOUS

PDF

75.2 KB Created: 2020-12-28 04:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8959f0593670cdda0f3943c474a47623 SHA-1: 1cf1f3d356c06adb6e1ec3102b023268b9766ede SHA-256: 73878d77438ac459d1b71e0d73a3203bef79eb428679dc51a8ce60ebf22cc1fd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards malicious intent, likely related to directing users to 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
  • 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://traffnew.ru/123?utm_term=lotro+guide+skills PDF link annotation
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/6724979.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/ggi7iiw/lord_master_king_riven.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/chcjcBT/wallpapers_for_phone_screen_download_music.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/fixate.pdfIn PDF document text
    • https://lerivifaladadov.weebly.com/uploads/1/3/4/3/134334847/sijaxituluzimuzi.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/kisimujuk/top_entrepreneur_ideas_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/zutugemirigurimizof.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/turnitin_originality_report_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/outlast_viet_hoa_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/76305491110.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/edition_wow64_platform_failed_sql_server_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/tareekhi_books_urdu_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/sports_merit_badge_worksheet_answers.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 4788 bytes
SHA-256: e7d097ada1dae1c0172fe1c5206fc6b399a7390b4b1b70876d2c094bf4e63f9c
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 11008 bytes
SHA-256: 39757ca9f591e1bdb7ca46b1ba386df459775b7e335b5dae23f54252323f2173

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