Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d1d093e993955d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-14 22:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 98b6f42c0b194ca881acdfdc788419b8 SHA-1: 763864c9963c59962cc32df9e94b99100e87cee4 SHA-256: 11d1d093e993955d4d07a44e530c0bf0c89fe90cfc3ee34ea7a5ef6e8958cf47
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful external sites, likely for credential harvesting or malware distribution.

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://jacksth.ru/aws?utm_term=bubble+shooter+game++for+android+2.+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601a80eb8531d.pdfIn PDF document text
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/9704878.pdfIn PDF document text
    • http://nulagumuxim.iblogger.org/rimumasuja.pdfIn PDF document text
    • http://naturmilans.fun/86511677004vuz7l.pdfIn PDF document text
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/f8168.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/4438749.pdfIn PDF document text
    • http://shop-you.xyz/jipojorosotititu3mxvn.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/112a9de5fc.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/ecdb801.pdfIn PDF document text
    • https://dikubudekoguzo.weebly.com/uploads/1/3/1/8/131857294/dopibajer-lureviwuxofip-katibapo-jifapete.pdfIn PDF document text
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/3164708.pdfIn PDF document text
    • http://universe1.space/comma_grammar_worksheets57cof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fe1630b26e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_601ab9040563e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamurujitexezi.epizy.com/gamawupivogajatizapup.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/5297342934.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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 5836 bytes
SHA-256: 1827c6c73d62bc762469a1cd2c26d491dc561b81fdc88e6e477cbde6c4f6f853
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 10240 bytes
SHA-256: 35cedfcbe6e4eac550875fc0be80935afb19d2c98be19d5e93a477981cc91a63

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