Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49f25557215b568…

MALICIOUS

PDF

64.1 KB Created: 2021-02-23 01:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 15519f01e06fe3c9d814cae72f8c7cbe SHA-1: 1d78343350cff677a2b204a398faf86b031b0894 SHA-256: c49f25557215b5684a0bd6721da91d2bf9a251b8bf4fa79539bc8c0eb3100443
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, https://yafferge.ru/strik?utm_term=the+endocrine+system+test+ati, is the primary indicator of malicious intent, likely serving as a lure for phishing or to download a secondary payload. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+endocrine+system+test+ati In PDF document text
    • https://cdn.sqhk.co/zumedizojas/fUiaBie/54567452367.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/jg5hgX6/naxavipifidilopujabagexo.pdfIn PDF document text
    • http://organic-ita.space/62486088726oqlxd.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/uXThaKI/lovecraft_country_book.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/ivdJgjc/9477534377.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/feIibjd/perijes.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/iwQgdOq/guriginuwojij.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/ejghhgc/walking_dead_movie_trailer_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ajfd7ge/45476246176.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/punurum/54966336152.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/screen_recorder_for_pc_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/alphabet_tracing_printable_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/delivery_note_template_word_document.pdfIn PDF document text
    • http://joponefa.rf.gd/what_are_the_3_stage_of_production.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/funeral_home_answering_service_canada.pdfIn PDF document text
    • http://koxaxinum.epizy.com/48353618030.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/carescape_r860_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/armenian_alphabet_keyboard.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_off0000c045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC045 5200 bytes
SHA-256: 647fa0afff048597e974641104ecc573954af43fd58a7b878964532da7008765
font_01_sfnt_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 9992 bytes
SHA-256: c4fe4092fd9f29f02e7b81df3713dc4773bb5d253c6ba3b0600e9ddb1aa891c2

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