Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe7deee21d3ee8f…

MALICIOUS

PDF

72.0 KB Created: 2021-06-02 16:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d25114826949ab3336e27f8a5e5c3e0b SHA-1: 58b54bcbca3f7bf974196244985bde1094ac21d0 SHA-256: 6fe7deee21d3ee8fde71d0d3ecaa6cecbb5c15c4e71ee6cd4e8f2c684d5db106
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a URL with a "utm_term" parameter related to a fake certificate indicates a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/pbw?utm_term=fake+experience+certificate+for+mechanical+engineer PDF link annotation
    • https://vizakadaji.weebly.com/uploads/1/3/4/4/134491897/digeromeliz.pdfIn PDF document text
    • https://getezulesu.weebly.com/uploads/1/3/1/0/131071231/3c21bc36fe184d.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/c20c8cde7745f3.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/tarival_nedapado_kazirem.pdfIn PDF document text
    • https://buxefakoxu.weebly.com/uploads/1/3/4/7/134744428/nubidoloreneramune.pdfIn PDF document text
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/loleduse.pdfIn PDF document text
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/39364.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/zoxewegonul.pdfIn PDF document text
    • https://degulula.weebly.com/uploads/1/3/1/0/131070998/41fa5867f123.pdfIn PDF document text
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/lekawivo_rurodinixabado.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/walilug.pdfIn PDF document text
    • https://nabizajeti.weebly.com/uploads/1/3/4/6/134640454/geliberewu.pdfIn PDF document text
    • https://xewiriwi.weebly.com/uploads/1/3/4/6/134645045/471debeea12.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/palotanetug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogituvu.pbworks.com/f/pichaikaran_tamil_film_songs_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b3a664-45ea-446e-a1e6-320e1029ac8c/how_to_tell_how_old_my_goodman_furnace_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3486d9-653e-4ea8-a2a2-0a7aaae59e33/saber_hacer_contigo_santillana_6_primaria_exmenes_naturales.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144414942/sijuxevoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98b5b30-4bdd-4838-b8bb-ce291e39e5e0/97409669077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4695bcb-4a64-4226-b5e2-19967cf7a51d/brother_hl_22400_toner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c510ad43-9ac4-40e6-a25a-82c6cb20a962/8422418031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/354dc273-f190-483d-8060-33095b904e58/63981576390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab1e960-495f-439c-bf4d-b83776063ec0/8037305080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d90c8f-7783-4f28-a4d4-c1d2208c2309/38398923549.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5336 bytes
SHA-256: 90a18b7b4ac8220b9e78396f713e87f3e96cd0f2af12445f0541efee36af8a2c
font_01_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10984 bytes
SHA-256: f8d96452d11d7e6d76b939e71123431d7962ab56d947fa20488408e32681e188

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