Malicious PDF — malware analysis report

Static analysis result for SHA-256 9211bbf5400a8d3a…

MALICIOUS

PDF

73.2 KB Created: 2021-02-12 22:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 89370fea31ad615d3aa5dc7a03da1093 SHA-1: 6c884623a64c3f20a4080166435db7670fe02cc8 SHA-256: 9211bbf5400a8d3a39c3302dcf7bd5ed7822d0d710593fa178649661580a0e35
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=polo+shirts+with+big+horse+logo PDF link annotation
    • https://cdn.sqhk.co/xewimoziwuvo/cjdLigF/fuwixo.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/XhhE3D3/60014961977.pdfIn PDF document text
    • http://alex-chekalev.com/alarmy_not_working_android_10f00zt.pdfIn PDF document text
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/5e6c1d1.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/pibgfh8/goat_simulator_payday_all_trophies_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/gDgheie/punivojigetatared.pdfIn PDF document text
    • https://cdn.sqhk.co/wepevuwu/gGjbjg5/hades_star_artifact_bonus.pdfIn PDF document text
    • http://busurman.space/may_2019_calendar_excel1oyxd.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/noxubonamala-kiwali-bojek.pdfIn PDF document text
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/zofoz.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/79b838.pdfIn PDF document text
    • http://fitdieta.com/lubijaxijojopelanedji8me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/chrome_portable_xp.pdfIn PDF document text
    • http://vabowako.rf.gd/panasonic_aw-_he40hk_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/kababexodubepupuxigola.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/96607525554.pdfIn PDF document text
    • http://ginojakoli.rf.gd/conservation_of_natural_resources_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/zuzupisozemakune.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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 4968 bytes
SHA-256: 65507663c4565a43ab2acb13813789381c6f0b2ff0a65dcb8b4062fa1e1d7ab2
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10428 bytes
SHA-256: 923cda291c60a4ea5990c765cf3ccdc9e77464c7262195a70065781e6a6140db

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