Malicious PDF — malware analysis report

Static analysis result for SHA-256 205ffbc20d900d9c…

MALICIOUS

PDF

79.6 KB Created: 2021-03-19 19:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f9e5772c5e7935254a6d4fe11f63e6 SHA-1: 56bef7441abc2ecae022ca433183793df5de33ab SHA-256: 205ffbc20d900d9c2290d40e9976eeb01a89aa8f81dae07d37b52986a752719a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The primary URL, https://jumiwimov.ru/aws, appears to be a lure for academic content. While no scripts were directly extracted, the PDF structure and the heuristic firings indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://jumiwimov.ru/aws?utm_term=quimica+organica+de+wade+5+edicion+pdf
    • https://static.s123-cdn-static.com/uploads/4486969/normal_60017838a0dc6.pdf
    • https://cdn-cms.f-static.net/uploads/4478946/normal_604f7b7251490.pdf
    • https://static.s123-cdn-static.com/uploads/4466680/normal_6000ea583bdef.pdf
    • https://cdn-cms.f-static.net/uploads/4449424/normal_600fe730eb90b.pdf
    • http://podifodosej.scienceontheweb.net/english_speaking_course_urdu.pdf
    • https://cdn-cms.f-static.net/uploads/4464068/normal_60482754f2203.pdf
    • https://static.s123-cdn-static.com/uploads/4366358/normal_5ffbcc927ef02.pdf
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6018ad5733214.pdf
    • https://static.s123-cdn-static.com/uploads/4505363/normal_5fe163551d90a.pdf
    • https://cdn-cms.f-static.net/uploads/4453540/normal_604cc1fed6ac0.pdf
    • https://cdn.sqhk.co/kadeposamo/xggjchj/vakoxalituvulibenifudu.pdf
    • https://cdn.sqhk.co/bezorufuv/bhcGfPG/zuwujamoluweriwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://savunibuguk.rf.gd/suvazokexomusuramuwuga.pdf
    • http://sarupisegov.rf.gd/belajar_bahasa_jawa.pdf
    • http://pivimufe.atwebpages.com/82508895087.pdf
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_3c026820efc14ccaa1017ec9cdd87797.pdf?index=true
    • http://batefagut.epizy.com/falls_lake_bass_fishing_report_2018.pdf
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_2ed1d34901524e41a2a64e9ae0dcf194.pdf?index=true
    • 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_off0000f7a7.bin
73cf21121e2e58ea7b4739e84e63e69cf0dee76777cf78f1c209cf8bf70a03af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 5544 bytes
font_01_sfnt_off00010a85.bin
cfde039e492de98c88e44df0ae8790ebb67d90c22ebfd94a3c7d7c68b1f9dbe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11696 bytes