Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76291a1ce0bcac2…

MALICIOUS

PDF

84.5 KB Created: 2021-03-23 23:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 380d1f7c9662836377cbecb4922d9674 SHA-1: 98660dd0a4d6fb460efc1e24cd0ceac616703c77 SHA-256: c76291a1ce0bcac26a9e6fc6c75c961e12c4c6cc2ce6d9baec5b77daa71158f0
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=epson+xp+6000+replace+ink+cartridge PDF link annotation
    • https://cdn.sqhk.co/monubinejon/OZ3geSm/luleze.pdfIn PDF document text
    • http://gufufisazikoja.iblogger.org/81417707173.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/ijjfjdw/mastermind_movie_2016_true_story.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/b31jijW/degozuligixobina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5feb89586d378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408706/normal_5fcc912aa4d41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mirajiletumumi.epizy.com/63396981311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714f8282-fc45-4a5f-a86c-fbcb168156ee/63130554014.pdfIn PDF document text
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_ec549e41aa2147cabae44057f00b6605.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/958b8a62-a70f-4269-b2e6-55f6ba0d5c68/goodman_furnace_secondary_heat_exchanger_leaking_water.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_422e16ed445c4604bd7707acddd77c16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd983232-f53c-46b3-8e56-f15ce6d8f429/husqvarna_460_rancher_chainsaw_parts_list.pdfIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_942770e7dfab48e2aac014092d1cd554.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ea1494-e943-47bd-872c-e7931baf9c6f/87666690068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8344cd7d-615f-4ff7-a55d-6f006dad3024/watuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39294d7b-bd88-492f-8d14-45cfa772e173/rainbow_vacuum_for_sale_australia.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_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 5628 bytes
SHA-256: 263fe94a054e354ac9f795b777945fab572ace104496d630cffd5378aefec0a7
font_01_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 11244 bytes
SHA-256: febe663c263317af8675e53b8765a1fe0671e7805fad91065b5e8bf326d2637c

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