Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dccbdb17e3f072…

MALICIOUS

PDF

80.2 KB Created: 2021-03-06 03:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 064337edbade0cf35e0109f4fd0d3450 SHA-1: 5fbb743291de9aec30f5b9df9c24d27c93122b16 SHA-256: 27dccbdb17e3f072f868741c4a1af57fddcc8563241c1d3bdba2835f30fbbcbe
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. Although no scripts were explicitly extracted, the PDF structure and extensive URL farm point towards an attempt to deliver a malicious payload or redirect users to a phishing page.

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://kuzutuzo.ru/wix?keyword=payne+air+conditioner+specifications PDF link annotation
    • http://kmplitka.shop/980326917695ubbg.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/repesufojajage.pdfIn PDF document text
    • http://housefashion.ru/kunikavo5lew1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5fca4457e0fed.pdfIn PDF document text
    • http://salonlabs.xyz/case_study_method_of_teachingvlsy7.pdfIn PDF document text
    • http://effektzhizni.ru/muxixifomapezepqsik8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474450/normal_602c5b3dda4f2.pdfIn PDF document text
    • http://health2health.online/what_are_the_8_steps_of_critical_thinkingapp1x.pdfIn PDF document text
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/bekinusizovesarikek.pdfIn PDF document text
    • http://astrology-personal.online/romeo_and_juliet_star_crossed_lovers_quotewls37.pdfIn PDF document text
    • http://dommasters.site/campos_de_la_psicologia_social_y_comunitaria7t23v.pdfIn PDF document text
    • http://idealicaufficiale.website/56980676711qwazh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_60335e78173c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_f464f15fb437449d8b1cc7baece2e4c0.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_c9e83dfd1c4c4fb59c39a11345f2a14e.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_bc493e9a854545df936c2df26f00f715.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_6c2a1d1ef67b4153a5da8d1703ab54bc.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_35df439087a24579b6e21958ead090d6.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_18a0f621c866458da2e032ac510577c0.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 5008 bytes
SHA-256: f63d0e33afebbf2206fad20ad4f75783aaae91720e0422287004ce6fc7669195
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10388 bytes
SHA-256: 95c1434522fbfc47bc647b529a43b623019f9db179199e4bbe8f9b5b52263cf0
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230