Malicious PDF — malware analysis report

Static analysis result for SHA-256 adba6bc668700540…

MALICIOUS

PDF

99.2 KB Created: 2021-03-20 16:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0b7686a6c94d3cb7979fc48fb9b53c9 SHA-1: dcce069379af9a729abf303d28bbd9d72b940751 SHA-256: adba6bc668700540eedd570dd93a387d68724a010aa85362df54bea10e086dd1
186 Risk Score

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 0.9996

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://ponafet.ru/aws?utm_term=define+free+particle+in+physics PDF link annotation
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/76822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_6018f48d86d9a.pdfIn PDF document text
    • http://ratebekanolaja.22web.org/ham_radio_technician_study_guide.pdfIn PDF document text
    • http://jeweboz.iblogger.org/dopix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_605447932ff78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_602919eea407c.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/1696847.pdfIn PDF document text
    • http://rojemop.iblogger.org/dowiziwavanaga.pdfIn PDF document text
    • https://geguwuwivoloko.weebly.com/uploads/1/3/1/6/131636947/kitezorefide-widojisud-sapimotujapen-kabezisajova.pdfIn PDF document text
    • https://xuxixoxeniti.weebly.com/uploads/1/3/4/5/134585484/3469778.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/nakapibuzupodovasif.pdfIn PDF document text
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/7319795.pdfIn PDF document text
    • https://vukuxafutuzex.weebly.com/uploads/1/3/2/3/132303027/futavefaza.pdfIn PDF document text
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/83018337e5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_e7f95b76226149c4a1d2de254b21cd3b.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_4472941210d0453aa19f08e4724902f0.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_b7e5603b8b234213a6d43c42587c9052.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_dca36f25250f467492bd1a4dc56ae03f.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_8334249cc61640779bfe19049f7333ed.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_89ec3886949b4f3c99b0483bf39618b4.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_4695e38d0c284db787eafcce688b316f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 5204 bytes
SHA-256: 1b667e3332a0c6efbc17322bcd260bb3faf7a463ccdf63a3b34cdcdf1bfb560a
font_01_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 14824 bytes
SHA-256: da42b494efec886c06f932b2e1fd418c229c9216b87476981d71481672a376a8
font_02_sfnt_off000167ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EA 16604 bytes
SHA-256: 0fbd658322bc9422b64554223f99b1b70d235ddb21288a0e8955c575681f49a5