Malicious PDF — malware analysis report

Static analysis result for SHA-256 181c74c5b452dfb9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 03:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42a903876d801aa50a90e8046d4d2933 SHA-1: 84434c836cbd4245cd683b22277b150098014151 SHA-256: 181c74c5b452dfb9aa9152a293073550125a0f1212f0162ef331a6c98a13b380
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or further payload delivery.

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://soxebez.ru/123?utm_term=latest+english+christian+songs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5fc8d9d04cdef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_604209b80c488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_60108dd6b4716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_601f74098fb59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_600fe41e827bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_602fb7244a517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fd9b330620e1.pdfIn PDF document text
    • http://card2card.live/cartoon_wars_blade_hack_mod_apk_free_downloadp8gtq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_60293fb1cbc7e.pdfIn PDF document text
    • http://216tilford.com/libezamaxativewilf104a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5ff526c3e72d2.pdfIn PDF document text
    • http://003-center.ru/vawodekudeposixifet2d96.pdfIn PDF document text
    • http://unosital.space/julakedajerariwugakuminuxm453v.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/97bcabf3-bfe2-42ad-94ca-8bcf5bd1a9c5/8750882037.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/line_graph_worksheets_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c595c350-10ec-4d67-8f28-e6315be9a856/cuntos_habitantes_tiene_la_ciudad_de_mxico_actualmente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07edb06-b26f-4271-9740-734d3bc1e0cf/fios_gigabit_router_yellow_light.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/24487239396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810e910e-5a5e-4644-86f6-0f90dbbeae74/lucent_english_grammar_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2dc2ce-1045-4ae5-ae52-3015017a6b85/wajaxudorivitutafodasoba.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/74397337405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f717ab2-79f1-40d1-b33d-229886847171/vermont_castings_radiance_gas_stove_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bhai_full_marathi_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ce0a77-eeee-434c-85a0-79bad84aba6d/will_there_be_a_gt500_convertible.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/15685479867.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_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 5000 bytes
SHA-256: d2400f37c29aa967fc36306b24c9661358d77798152d49d8fc554a492a13373c
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10712 bytes
SHA-256: 1956a99697f65ffcbd586d5c458b6474022cef72e4660b774d326044edcb4121