Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8b157489f8bee4…

MALICIOUS

PDF

81.9 KB Created: 2021-03-10 21:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8f6ef0002234229185fd736d795d77de SHA-1: 3e3a2a3c069e538717b6ec41a78c929da3b3a46a SHA-256: ed8b157489f8bee482c2e337eecf2fb35f7a982e1df785bbd53333332cb12418
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 0.9997

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://vilenefex.ru/123?utm_term=boot+from+usb+asus+transformer PDF link annotation
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/2e8242.pdfIn PDF document text
    • https://tikivumisa.weebly.com/uploads/1/3/5/3/135346314/mitadatebuzosi-loluva.pdfIn PDF document text
    • https://fizupubiwox.weebly.com/uploads/1/3/0/7/130775838/wuvewisumaz.pdfIn PDF document text
    • https://lerozezowigex.weebly.com/uploads/1/3/0/7/130776164/widupuvekaladadiga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5ff9648abdeb9.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/4dddbd92a43b.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/e8c4419.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/Chhnqig/ridulijomufelegef.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/pifagoxami-vufiw-wobaxerim-pudidijego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fd3157509604.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/cedar_point_map_2020.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/kasemimedisumosonugi.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/hfijMfb/58279499513.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/67565886c39aa.pdfIn PDF document text
    • https://lagukowimewalis.weebly.com/uploads/1/3/5/3/135335318/sumolekunifen_nadakunik.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/5485903.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/244294c375b5.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/a200e4155b.pdfIn PDF document text
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/887191.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/1c163f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/beginners_guide_to_digital_painting_in_photoshop_characters.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_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 5072 bytes
SHA-256: 338e9d245bd68f058f4b2047d6cf7aa87ddb52c606de0937b4be6dc6345284ae
font_01_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 10896 bytes
SHA-256: 42ca2026adbb43ad3499f46d89308a6fd6e0da6be0ad82c1a1cf4aa95853d650

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