Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9baf3e77e50e947…

MALICIOUS

PDF

78.4 KB Created: 2021-05-31 21:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c3ddba1fda4aa628fb931ece1e9ecbf2 SHA-1: d9cad73ded8ffc5e5d91d63fb3eecf8784ee2902 SHA-256: d9baf3e77e50e947b4c0e61744926fb4489d7c5fe37cf305bcca5b4405a9a98e
206 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were extracted, the presence of numerous external URLs, including one pointing to 'gimoguvi.ru', suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://gimoguvi.ru/123?utm_term=email+marketing+template+builder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421640/normal_600a417208635.pdfIn PDF document text
    • https://nawigabijaku.weebly.com/uploads/1/3/4/5/134599080/0054d5e9cc0b.pdfIn PDF document text
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/3572094.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/xomiwewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_603bbe6f4ea3d.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/gezasizivojiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_60064c547b5d2.pdfIn PDF document text
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/807256.pdfIn PDF document text
    • https://nisofopirumo.weebly.com/uploads/1/3/4/4/134478351/b6ec34ceff15f.pdfIn PDF document text
    • https://pezasagizagifoj.weebly.com/uploads/1/3/5/9/135968908/8599399.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/2f9e020b-7dd1-4af1-b788-551902407c6f/vekopisogopora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8593bc94-f1c0-47f3-9619-068732a556dd/2006_honda_civic_coupe_wheel_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c7b837-6dfa-424a-8ae0-500fcd6f47fe/how_to_reboot_ingenico_card_machine_iwl250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c63c7a2-9ce5-42ea-af42-2f33ae661a6a/how_to_draw_anime_bodies_female.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d1ac38-6e1a-4c35-b4e7-26ca065d5914/book_review_of_ponniyin_selvan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a63fcb-581f-4e61-9c69-10317514d81f/diwutekisubegiduroso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c714f2-c29b-4f5e-aa4a-d6104729ae22/object_oriented_programming_python_3_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7b1120-826f-459d-b5cf-b3dc35b1caad/lazarillo_de_tormes_tratado_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec848283-38a4-434e-a125-28a8afab519e/jufowelomofamosumebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8446af-ffe7-4770-9ada-e1dc61251aef/vubowidemidiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd82e94d-e277-4d12-b8a2-4fba0438d94d/ropirolalujo.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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5260 bytes
SHA-256: 59b781de5a5158b19c658777d9a6c87e1afc8ed0b7d654822cf6919f04a655b5
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10988 bytes
SHA-256: 191879fa499daa64e0cfb4e9c232d66c2eca77c5c84ce74becced62cb2543a1f