Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c37efd78a28d2e2…

MALICIOUS

PDF

79.9 KB Created: 2021-03-24 00:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be96b75a01a783abd32ec80c909f4d1b SHA-1: 894d602b04bfc68f16f15c9e16dbd2d0c63736c0 SHA-256: 9c37efd78a28d2e2899afca3c17d587bfd5f789635e388ba0604027611175156
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/award?keyword=all+bollywood+actors+name+list+with+photo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418171/normal_602a455107bb2.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/dr_jekyll_and_mr_hyde_book_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_60035034a4de0.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/biology_book_for_class_9_sindh_text_board.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/latasifudifef.pdfIn PDF document text
    • http://gesufumepemu.22web.org/67959067024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_60047b9ad4a10.pdfIn PDF document text
    • http://tamakar.xyz/bekudobezudigamovari60mhy.pdfIn PDF document text
    • http://mx50off.info/lifimusuzubukesibu5h9.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/18119470281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fcabc4a30788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa15f3f-7434-4296-9721-2c1096c3732e/what_does_slant_stand_for_in_avid.pdfIn PDF document text
    • http://nufufud.epizy.com/ligaladirolovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc14eed3-73aa-484f-b737-5c3a660aaeb6/12651230649.pdfIn PDF document text
    • http://wabelat.epizy.com/valal.pdfIn PDF document text
    • http://rolozipufulelo.rf.gd/15210190208.pdfIn PDF document text
    • http://vepibali.rf.gd/how_to_write_reference_apa_style_no_author.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/20337576332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/986afc3b-aded-4934-93f3-0bab34c0927f/94812492904.pdfIn PDF document text
    • http://gamupuzif.epizy.com/zuraliluju.pdfIn PDF document text
    • http://vomonulesew.rf.gd/pdf_split_sejda.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 5716 bytes
SHA-256: 6dee524e32d5534d37801564173fcdedf941d077857f3d22a63c69670abab36b
font_01_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 11316 bytes
SHA-256: 69cd90ec9390b4da3e271dfbfc5f8e7565becdca1306ae04506df66bc94a88a8

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