Malicious PDF — malware analysis report

Static analysis result for SHA-256 e564e3871b284b8f…

MALICIOUS

PDF

71.6 KB Created: 2021-01-22 13:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5176156c7ecb4f52c1e7bcf66e318bce SHA-1: 679b3e2ba791c1cb1a73e5aed2ff125e897eeafd SHA-256: e564e3871b284b8f71af64b445388ff1c49ec2665a01f345e682f2cde4a5a9f9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a link farm designed to redirect users to numerous other PDF files hosted on various domains. This behavior is indicative of a phishing or content distribution scheme, potentially aiming to manipulate search engine results or deliver further malicious payloads. No scripts were extracted, but the extensive link farm suggests a malicious intent to direct users to external, potentially harmful, resources.

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://seumenha.ru/123?utm_term=cert+guide+to+insider+threats+pdf PDF link annotation
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/8319892.pdfIn PDF document text
    • https://site-1176298.mozfiles.com/files/1176298/sowobitoxedodurofikatubo.pdfIn PDF document text
    • https://site-1227499.mozfiles.com/files/1227499/aew_fyter_fest_live_stream_bleacher_report.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/517446.pdfIn PDF document text
    • https://site-1176713.mozfiles.com/files/1176713/bang_bang_song_lyrics_nancy_sinatra.pdfIn PDF document text
    • https://site-1084052.mozfiles.com/files/1084052/formation_aide_soignante_cours_soir_nivelles.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/begenezu.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/simple_admin_template_bootstrap_free.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/51640797512.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/tegupe.pdfIn PDF document text
    • http://rumagadoli.22web.org/language_translation_arabic_to_english.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/jiguwuzobozobaz/lasatibe.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/30086778824.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/25053188311.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/common_cashier_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/zerunilok.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/tiwolivisemuvowenak.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/bc_fishing_guide_license.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 5176 bytes
SHA-256: 32754b7f03cf440eea86db2387b31f4d7bf31fd2758fca66cf5a55eb9fd28ffb
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10844 bytes
SHA-256: 24eb17264adff83bd4afc7a9144ddc56877b06ae9af62c29104e910466e68818

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