Malicious PDF — malware analysis report

Static analysis result for SHA-256 b626039b4e5f96bb…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 23:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d3673669f5cfd4c76363213a7a5aa8a3 SHA-1: df0212b8024bd4609f48e42bd6eacb61e8ed8420 SHA-256: b626039b4e5f96bb290c1356f3a2ebae89f78aff9ccddfaa99ba80f61aec08dd
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the document's structure point towards a phishing or redirection attack, likely intended to lead users to malicious content.

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://ponafet.ru/strik?utm_term=how+to+get+engineering+job+with+no+experience PDF link annotation
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/b62184.pdfIn PDF document text
    • http://soribowunalosu.22web.org/lurubiluxav.pdfIn PDF document text
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/7720734.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/sisizufiluxe.pdfIn PDF document text
    • http://pumeputokamodo.22web.org/bsc_agri_admission_list_1st_round.pdfIn PDF document text
    • http://lipejilun.iblogger.org/43122567224.pdfIn PDF document text
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/kosibodegi.pdfIn PDF document text
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/bilajafelal.pdfIn PDF document text
    • https://bufotikebejunut.weebly.com/uploads/1/3/1/3/131398235/6a3fe.pdfIn PDF document text
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/kiruferisuxuga-fokuwabidexusid-tipobusoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezerokefewuxon.rf.gd/lacrosse_playbook_template.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/how_to_rebuild_coaster_brake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0940a1-c2a9-4e1c-8a7d-941f6920b507/55493577348.pdfIn PDF document text
    • http://getetir.epizy.com/bodukeperivuwus.pdfIn PDF document text
    • http://jojexapopexevof.epizy.com/nekafagolilexi.pdfIn PDF document text
    • http://guwibigebozodeg.rf.gd/gosuperotafuxidoturomebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c170e61a-398a-4005-9686-ae28da8d8a38/bissell_proheat_2x_revolution_instructions_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e213260-16c9-45be-b230-3bee8a6fc42f/ncbi_bookshelf_molecular_cell_biology.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/qualified_audit_opinion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff9b9d8-ec40-43a5-9203-5ca971834aa1/49252266711.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 5112 bytes
SHA-256: d59797f1a2566b0ba3a5aae3125e6883f69902ed80d4f66a2e683412b0167649
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 11448 bytes
SHA-256: e364473323bca786d84629bdf08f65f134e0f79126f695bc6802bc18a7a47fcb

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