Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9064c9fdd71e646…

MALICIOUS

PDF

79.8 KB Created: 2021-03-20 07:28:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 61a6331d2c2dfc4402935008b3762e39 SHA-1: 204ec410e5ca622a37d2d123ab66b9da4e615872 SHA-256: f9064c9fdd71e64697459c2ab9f59ded087939ae1dcc29487ea8aa7229ead45a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=what+does+cronbach%2527s+alpha+tell+you PDF link annotation
    • https://ratudizog.weebly.com/uploads/1/3/5/3/135323835/d707c968.pdfIn PDF document text
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/1712825.pdfIn PDF document text
    • http://dodunagosukew.iblogger.org/gofurewawuxofujegevukozik.pdfIn PDF document text
    • http://teasmall.space/24051077069pm1mx.pdfIn PDF document text
    • https://fozuwopakinijur.weebly.com/uploads/1/3/4/6/134617915/ad00836fc2.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/78987595394g1d6k.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/xovin-tavezelipufi-diretizeriw.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/2189720.pdfIn PDF document text
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/nunotesal.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/xepovijapiwi_kasasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_4292f8eb10344e0ab96dde98add34174.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_f61414aca60c476ea9aaf88d4eeb17ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risisipajole/67654749488.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/so_sad_today_melissa_broder_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/jopiwefotew.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_7c886ffb38ce4c579c92121a2667da5b.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_efba3487e2a64ace8eed5899c9dd8585.pdf?index=trueIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_962b83676672486c890a93dad9a7bd10.pdf?index=trueIn PDF document text
    • http://vijanemafe.rf.gd/economia_ambiental_barry_c_field.pdfIn PDF document text
    • http://gugujis.epizy.com/gavotte_piano_sheet.pdfIn PDF document text
    • http://nitovotiroxe.epizy.com/kagisejudizora.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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5448 bytes
SHA-256: c937504b0382bff9889286cb114c2b57e49278378bf28ce544eb3f450b0b75ca
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 11848 bytes
SHA-256: 7b70ed28694846e9f93e77e9f1fd05be9edea158f5f9475abada0311954735d4