Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a0eea43a501a87…

MALICIOUS

PDF

76.2 KB Created: 2021-06-10 14:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 491eeeb145f67acdfa84de2de0ef5356 SHA-1: 52b6259f9a232505f0411a408ab39dea7d907d94 SHA-256: 45a0eea43a501a87279acd2a1a25ff73f023a507a427961116c056ed6d1da8d7
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://ketchas.ru/pbw?utm_term=theme+powerpoint+free+2020
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/794450.pdf
    • https://jemogofeti.weebly.com/uploads/1/3/4/0/134042608/zamiwuk-gejowibasit-badovigaraxaxon-gowexuninobuta.pdf
    • https://gupifamerimim.weebly.com/uploads/1/3/4/1/134132082/976088.pdf
    • https://mugibutu.weebly.com/uploads/1/3/4/7/134714928/0ea47316f8b0db9.pdf
    • https://cdn-cms.f-static.net/uploads/4408324/normal_603a26bb78b05.pdf
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/kananogava_tovavino_nerewodaxowulel_bibajixusabate.pdf
    • https://rinugofanux.weebly.com/uploads/1/3/1/4/131437530/vutiburilase.pdf
    • https://tupalomixesitet.weebly.com/uploads/1/3/1/3/131379559/9849718.pdf
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/dotonaxaweb.pdf
    • https://cdn-cms.f-static.net/uploads/4376126/normal_6027955970544.pdf
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/medulafexibel-xevibusul.pdf
    • https://kepegefamoza.weebly.com/uploads/1/3/1/3/131398453/eb8820e0a.pdf
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/8b4db686c8eb.pdf
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/7478249.pdf
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/nonugi-subebolom-vavekedibebo.pdf
    • https://tilifezazam.weebly.com/uploads/1/3/4/7/134763305/filumuvonujoda.pdf
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/2272291.pdf
    • https://cdn-cms.f-static.net/uploads/4504554/normal_6021d2a2bc181.pdf
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/5673163.pdf
    • https://cdn-cms.f-static.net/uploads/4421770/normal_605243e7b26d5.pdf
    • https://ramaxuvezida.weebly.com/uploads/1/3/4/3/134327775/gexixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6948314d-2266-4d6b-9d27-c394aeb611df/kitagokiravowirupiko.pdf
    • https://uploads.strikinglycdn.com/files/8013c80e-341b-436e-a26c-476c39957148/how_to_draw_easy_on_procreate.pdf
    • https://uploads.strikinglycdn.com/files/2e0bf8ef-6bc8-4d9b-9cf9-f98f1269238e/14327613801.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed40.bin
2adc19d99c15e11902b6b1dff15217fa786bf4ae79ae44eb1ca621c7f270918c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 5036 bytes
font_01_sfnt_off0000fe4e.bin
ead574f90abf31ce43fe66b073e0a0e1ea0c63141021e0f559495a4e8f47248f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 10784 bytes