Malicious PDF — malware analysis report

Static analysis result for SHA-256 c831a55e580b5e70…

MALICIOUS

PDF

75.1 KB Created: 2021-01-03 04:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c9e5ac2b8427505b189b05031520f8ab SHA-1: 939be8ba4b42cae03e5c328bf001d647a75da065 SHA-256: c831a55e580b5e707720ac109bcd5f2b860e737ca3c7c5a65d657b8a855295a9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://traffmen.ru/aws?utm_term=aerospace+science+and+technology+latex+template In PDF document text
    • https://cdn.sqhk.co/sirejeforox/ghhpghj/tekobimizomizegizaxorozux.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/lekov.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/2f4b068d511.pdfIn PDF document text
    • https://cdn.sqhk.co/gobikazifelo/ZtF7Iqp/all_secret_codes_for_rocket_league.pdfIn PDF document text
    • https://cdn.sqhk.co/bakavaxa/RU3tPJS/rock_music_playlist_best_rock_songs_2019.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/lanubili/ijazat_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/the_purple_book_biblical_foundations_for_building_strong_disciples.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/how_to_add_report_type_in_salesforce.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/belax.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/44511569458.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/fobagoji.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/graphing_rational_functions_worksheet_and_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_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 5648 bytes
SHA-256: 95bba8d92ec55f3d1f650fe8b4b49958dea5031d741441797edf480d28233435
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 10588 bytes
SHA-256: a54ce2c003abcdb704d82c0be2ae5fdd620f11a4b37dc5cc46605652cf2abba4

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