Malicious PDF — malware analysis report

Static analysis result for SHA-256 2911ada41bf99ac7…

MALICIOUS

PDF

71.9 KB Created: 2021-04-01 06:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 45c539f44e3d00a41408aefcf5c35840 SHA-1: 0ef515aac4559f99ef71d4f58cf887c15e9c98ca SHA-256: 2911ada41bf99ac7f3433f3f8b2d24fe128363cf15299df11db0b195ba51e5e5
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://golowaki.ru/award?keyword=analogico+e+digitale+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6026366949d01.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/collins_english_grammar_and_composition_class_8_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5fd81d0d44e57.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/2509252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_60637d937f3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_605f0cb333cd5.pdfIn PDF document text
    • https://limemival.weebly.com/uploads/1/3/4/6/134610694/vumabufoxejemij-gikuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fddae5cb50d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ff3c20025648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketabigumowun.atwebpages.com/xesagixav.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/metroid_prime_2_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/bevozerolov.pdfIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_aa8551a7357b452fa06fa60a4b8ad527.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_e87fdc5c20e447adac427261ea7d1bea.pdf?index=trueIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_44d73931f6774bfd931d7abac7086c8c.pdf?index=trueIn 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_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 5036 bytes
SHA-256: 012eafbeb9c09970bfb9159d60d7868183bb2d957f76d10feffb6399bb5b315b
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 11488 bytes
SHA-256: 5dd4c2c8d53fce24de2e32e91ebad304fa548b72b322bd54097f4b89bd1fccbb

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