Malicious PDF — malware analysis report

Static analysis result for SHA-256 61437ff5b87b4593…

MALICIOUS

PDF

116.5 KB Created: 2020-12-08 22:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 87125880c97db18e0293af254e298de6 SHA-1: 922b8bd9ba707d4d153a3c86bd3455eb0f534534 SHA-256: 61437ff5b87b4593209bae5383da0b63f06dba45c084d66c3f3acf378081f0d2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://cctraff.ru/strik?utm_term=hagia+sophia+definition+world+history In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_5fb613b3577e7.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/suxixapajil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5f949e707bdba.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/fuzafuzeruwit/73931058054.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10ac260f2895dc1e8a19d/t/5fc48593f81c9a2a0c33026e/1606714771525/inficon_d-tek_select_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/suzuki_violin_book_1_minuet_1.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/urdu_books_format_free.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/65325483156.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/ordinal_numbers_list_1-_100.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/convert_to_word_adobe_acrobat_pro_7.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c991c6d9645836219624/t/5fc14acb3570fb44d132617d/1606503117522/45_45_90_triangle_worksheet_a7-3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30fa5bda9c57a97cc46e9/t/5fcf07e2cd9a2056ff6d98d5/1607403491990/download_evil_cogs_mod_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fd9af9866f3fd2d4d777/t/5fc193d9f8cdb769c61f3346/1606521823467/vufor.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_off000183df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DF 5456 bytes
SHA-256: 9ad85295ac0a53e3e7338543536ffd3f8ad642e45daca7fd618bbf7a3cc82c90
font_01_sfnt_off00019682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19682 14892 bytes
SHA-256: f03b2b69186855e306e339859d7f330d1ca373fefa2337c0039d6285ea540f98

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