Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0299f90ad50b4e…

MALICIOUS

PDF

77.2 KB Created: 2021-01-20 13:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bfccd7614acfa50af5adf4c03cdb3f52 SHA-1: 7b7512f2e7504c8698f5998b531880fcfcc95e19 SHA-256: eb0299f90ad50b4e941d8f036a5e423f2e0c26a8ee51ec171ae33adda4fe1a10
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The presence of multiple disposable hosting domains and UTM parameters suggests a phishing or SEO manipulation scheme. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=hershey+and+chase+radioactive PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5fde4b399f5e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5fffcd9ecf594.pdfIn PDF document text
    • https://cdn.sqhk.co/garoresolif/Zjjhjle/home_manager_jobs.pdfIn PDF document text
    • https://site-1176294.mozfiles.com/files/1176294/62283176162.pdfIn PDF document text
    • https://site-1177662.mozfiles.com/files/1177662/let_it_go_piano_sheet_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f926b03dc266.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/a2qVigU/34116757282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f8743160710e.pdfIn PDF document text
    • https://site-1182082.mozfiles.com/files/1182082/candy_crush_soda_saga_level_974_strategy.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/99204753807.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/93f4ff6e2.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/64ibaxv/best_hair_salons_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/3mgIkbT/97613841468.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/zunewidimem/application_form_for_uk_visa_from_uganda.pdfIn PDF document text
    • http://gebozobab.epizy.com/ap_chemistry_kinetics_lab_answers.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5120 bytes
SHA-256: c2cc20ce9172f75b3558f8fac5b9db20bcbc6140bd04c04258443c1953899897
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 9960 bytes
SHA-256: 96a0730f608c5a89d217bedc4ac04ccfb2c395528ca1e91fff69f754f490e931

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