Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfd65c5cfeb86ff…

MALICIOUS

PDF

81.6 KB Created: 2021-03-14 19:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ff5d82770d3dbb0a1c9b733198793b22 SHA-1: 76ecf0030faf7439135e7cf8d713f8f5c2860be2 SHA-256: 9cfd65c5cfeb86ff7092ae819cf306d5f950d924e108d8553a710bfdcb395326
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic indicating a link farm on disposable hosting, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains keywords related to 'Orencia package insert pdf' and the authoring application 'wkhtmltopdf', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=orencia+package+insert+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6031d28d1a2a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fff14381b9c5.pdfIn PDF document text
    • http://milesnires.xyz/english_conversation_practice_sheetsnceu8.pdfIn PDF document text
    • http://bagopuzexesop.iblogger.org/givilawa.pdfIn PDF document text
    • http://tevfikyuce.xyz/80370934764em35c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6017287d43443.pdfIn PDF document text
    • http://electriccannoz.club/50002957496i2xb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495707/normal_60091876160cb.pdfIn PDF document text
    • http://idealica-ufficiale.site/737938663219hs1j.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/array_function_in_php_with_example.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/zosuvizalubarisamenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fe6a69b9703b.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/60789630101.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/jiwariz.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/formato_de_arrendamiento_de_vivienda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bukulifuxevet.rf.gd/ciencia_ficcion_cuentos_cortos.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_0ba8cc3afec241afa0ab16066f3c926d.pdf?index=trueIn PDF document text
    • http://xotaferuju.myartsonline.com/ascon_tecnologic_k38.pdfIn PDF document text
    • http://jixopomud.epizy.com/bossypants_photos.pdfIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_ffdf5e456a994da2a7f33a63b61646f0.pdf?index=trueIn PDF document text
    • http://tadoloko.epizy.com/tirefuzesubof.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_aae3716d77454737a571f26648865a7b.pdf?index=trueIn PDF document text
    • http://bopunuzas.rf.gd/61298391559.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/blade_and_soul_unreal_engine_4_date_europe.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_off0000fd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD14 5380 bytes
SHA-256: 65596e816836c648a8ccbc28ee09bd8c836a585855b61fc02d1948c8cbdaa980
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 11640 bytes
SHA-256: 581dfe9609932f63a811ffa864e9bd65790ef94bf0e15e46239ee85e4c4f9e16

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