Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8056df16a19c629…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 10:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ca28759213867b01e06a8d81eff6856 SHA-1: 1079b51729d6810be61bd3a98ebd009ae6f97f9e SHA-256: c8056df16a19c629636fbb8737de15a4d2421f628a096be52be05f8aff00f24e
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=cobit+process+assessment+model+pam+pdf PDF link annotation
    • https://cdn.sqhk.co/wuvinudubuno/OTbijjj/palirugopowawigasubo.pdfIn PDF document text
    • http://topafigo.mypressonline.com/89394071298.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/mta_new_york_map_download.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/davuburusisu.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/kobogegedo-zelol.pdfIn PDF document text
    • https://xajekedifa.weebly.com/uploads/1/3/4/4/134469171/tunemeruno-pogoke-vojewoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_60324a2675ab2.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/gihiSFY/dub_dash_apk_mod_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6034560f38d16.pdfIn PDF document text
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/8826460.pdfIn PDF document text
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/fe397d76f2c6.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/2532261.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/kotugowibivelidad.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/pelaxoxegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_604ce87f4c05e.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/lexufabenogafurupitarit.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/birebazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/dunkin_donuts_wake_up_wrap_recipe.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5344 bytes
SHA-256: 44b55017e3044e8ae9bcd01006d8633e4237a1d9bbfaa1ecab06dc360f887089
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 11616 bytes
SHA-256: de7183068a0c6701d21dba8e4a48bc9b1a77f3b73b6f2cf1fbdec5fd05401740

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