Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fd5213cebaab35…

MALICIOUS

PDF

69.6 KB Created: 2020-11-29 09:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d3fed19801224e69017289006144004 SHA-1: 5ce0d123ccc40aae148ae641015612d7f3fa6d13 SHA-256: 17fd5213cebaab356e2b584fb01051cc77c855e40bbbfb1bdc59d245d19a746a
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further supports that the document uses a fake invoice theme to trick users into clicking these links, which likely serve as a delivery mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/aws?utm_term=invoice+template+uk+free+excel PDF link annotation
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/xexojosaxexuwa.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/memakikakid.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/zelomezawafuno-rokikalevipaf-fipabubifevi-zozokez.pdfIn PDF document text
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/2327708.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/55555.pdfIn PDF document text
    • https://digufotunu.weebly.com/uploads/1/3/4/2/134266503/662c80.pdfIn PDF document text
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/5268500.pdfIn PDF document text
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/7834877.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f61b7b-ede9-4ba2-a925-a2a6aeee0458/67866637937.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/memphis_tn_time_zone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a5c0e9-c583-4907-9d70-727dddd53f8b/zappos_case_study_harvard.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/body_ecology_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/legumixoja.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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 5112 bytes
SHA-256: 1dc2d9c12fc1fc10e4f6c0e26f1cebd227465a165db67b277ed9da7b78679e99
font_01_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 10532 bytes
SHA-256: 7b406255f5e60cc019e2992b72382158392dbda13a96a766ad720812f4eed629

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