Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87c89b9657c948c…

MALICIOUS

PDF

77.3 KB Created: 2021-06-08 23:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 25b5e53c71db8513110088a87a1b7c14 SHA-1: 18b9739d00ec0082a107d8609a5a0dc31db5154b SHA-256: e87c89b9657c948ccfadfdaaa0920bd9b48467fd48a587d8b977367b2c9a5aac
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or to distribute further malware. The presence of a 'download button' lure reinforces the idea that the document is designed to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=stick+war+legacy+mod+zombie PDF link annotation
    • https://reregixezoxo.weebly.com/uploads/1/3/4/4/134461721/devaxalasezo-pikilo.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/didipusoxenevamal.pdfIn PDF document text
    • https://vigojipawus.weebly.com/uploads/1/3/2/6/132695212/5750e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_60298a801f596.pdfIn PDF document text
    • https://gerozelijoxujib.weebly.com/uploads/1/3/4/4/134476991/zoponiwem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5fdf6404508ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_6014cb0613bf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fd233cd697e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_60bc0ccdb55e0.pdfIn PDF document text
    • https://fedoxamanisoru.weebly.com/uploads/1/3/4/6/134668372/nigutesinotopad.pdfIn PDF document text
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/nenotevitojugod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_6036b451c9389.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463788/normal_60b05405454a7.pdfIn PDF document text
    • https://vowimodinin.weebly.com/uploads/1/3/4/5/134599446/sawugupujinuduli.pdfIn PDF document text
    • https://vatizojisizekig.weebly.com/uploads/1/3/4/8/134852150/nefegudapu.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/18848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6033f556cc53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_6014277d148c1.pdfIn PDF document text
    • https://vuloninufe.weebly.com/uploads/1/3/4/0/134012437/gemuf_makozoke_xemun.pdfIn PDF document text
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/dumivogavabimoxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabevexizoj.pbworks.com/f/91085708920.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/subject_and_predicate_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • http://xuzokufo.pbworks.com/w/file/fetch/144678864/9988944959.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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 5632 bytes
SHA-256: b6721eb12b25d5b5c2e0ea1b69a9731f0eb3a41ace475dda3b6731448372f140
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 14020 bytes
SHA-256: 7a2b34625e66240d0c1fccd88b8a8c9eaf5762ac90623252feacb07d82b705b9