Malicious PDF — malware analysis report

Static analysis result for SHA-256 e138e8b140c351b4…

MALICIOUS

PDF

68.2 KB Created: 2020-11-12 18:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c18d06093cf4db642a2845d2098bb594 SHA-1: be55bf85622c6f7d006a741d3305799251f05d8c SHA-256: e138e8b140c351b4b76268d5d1d967b1f6f4de15d3441ce2f97afd8c60ab89bb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'wkhtmltopdf' in the metadata and the structure of the embedded URLs, including UTM parameters, point towards a campaign distributing malicious content disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=the+anxiety+and+phobia+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5f97116163b93.pdfIn PDF document text
    • https://nazivuwe.weebly.com/uploads/1/3/4/4/134452961/8a04f599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f9be6898d2f0.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/rukafofafegebotaran.pdfIn PDF document text
    • https://katexiru.weebly.com/uploads/1/3/4/5/134576370/87e08458e.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/kasatisi_vetetipedimix_pudulajelitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f89bf1f59731.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/7333566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/25814514136.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/black_and_decker_cordless_pole_saw_lpp120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99dc070-bb4e-48bc-a793-f63b704debc6/creatings_in_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/94987994512.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/ashirvad_cpvc_pipes_price_list.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/natinodalojijotegivem.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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 5332 bytes
SHA-256: 1de4f22b1ef6436c1ef5c2389dcd879fb5ca7db58ea1ef76da820c902148c539
font_01_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 10192 bytes
SHA-256: 8dfb93c09038c1356b5d41519068645c70a6f0e1c850377a3fe3adbe28c18258

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