Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb72b1d03ebd38f6…

MALICIOUS

PDF

83.7 KB Created: 2021-05-28 09:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f0f438899a42c13f102d37ab97494608 SHA-1: eef82daab648b41e354170b694d068a6e14baa3b SHA-256: eb72b1d03ebd38f65901ee7b64504adb99a625c0fe9086d186194afcf40a7be0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=n%25C3%25BAmeros+romanos+del+500+al+1000+completos PDF link annotation
    • https://nufivinob.weebly.com/uploads/1/3/4/6/134682897/runujexonuzov_wonukagoguragol.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/suwogavuzizusinej.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/poximebifobo.pdfIn PDF document text
    • https://gubizotalu.weebly.com/uploads/1/3/1/8/131871644/c0103ad2dbd44.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/wirogefaxose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5fee2d808bc17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_606d3a7257be5.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/lasuf-tudaworupifedoz.pdfIn PDF document text
    • https://zobovakobazazu.weebly.com/uploads/1/3/4/3/134319401/339ef3d92.pdfIn PDF document text
    • https://daxajofu.weebly.com/uploads/1/3/0/7/130740026/20c9499db81f.pdfIn PDF document text
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/036a5b3e6.pdfIn PDF document text
    • https://bobilomagavakux.weebly.com/uploads/1/3/4/8/134868487/6437177.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/41c92d767a47.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/141195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe1cfbc54d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_603ef9f44bf6e.pdfIn PDF document text
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/8978a.pdfIn PDF document text
    • https://zizizibewanexu.weebly.com/uploads/1/3/0/7/130776642/nafafaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422638/normal_5fcc4cd4e18fc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454562/normal_60affd7e29ee2.pdfIn PDF document text
    • https://ledunadexaw.weebly.com/uploads/1/3/0/7/130775166/5350188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_604dcd7a08168.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/xeratalexavasenok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6029b78683768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 5360 bytes
SHA-256: 5de9426d44f239922711be39fc0a03b46e0f01ca9deb639562ccf9a0be8550df
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 11244 bytes
SHA-256: 63689bfc536337e3c58752f34a9f2de9d6ac785999ec9bdec3e4a3e2f37c3c75
font_02_sfnt_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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