Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adfde6e9c9ed5df…

MALICIOUS

PDF

87.3 KB Created: 2021-02-24 17:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a4124d0b9fa62f9cec453b8fdf28579 SHA-1: 2ebbb5331645f2d533993d9a8f526779d0ae889f SHA-256: 4adfde6e9c9ed5dfe05e2765fc4ebf83d28ce58b252ffca7b6ecf618fde9a3d4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links pointing to external domains, many of which are flagged as disposable hosting or are otherwise suspicious. The ML classifier strongly indicates maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute links across many domains. The primary goal appears to be directing users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/aws?utm_term=what+does+a+sales+operations+specialist+do PDF link annotation
    • http://help-bluebadgecenter.com/basic_english_grammar_quizfw1rj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_60191cd71ee4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418587/normal_600003841f945.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/gabubumemifaregikav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6022e7d4c35d2.pdfIn PDF document text
    • http://brumbum3.xyz/114886769167q9m4.pdfIn PDF document text
    • http://kittyplay.online/jesimilonewixazjjh2.pdfIn PDF document text
    • http://unonatur.space/understanding_options_second_editionigfjz.pdfIn PDF document text
    • http://jokixulu.iblogger.org/38209056922.pdfIn PDF document text
    • http://my-favshoph.online/harry_potter_raised_in_germany_fanfictionyx6x8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_601b8b45e794b.pdfIn PDF document text
    • http://italywow.info/73774741950mi9lk.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/fexuror/nsw_lrs_lease_guidelines.pdfIn PDF document text
    • http://posewabenuxinot.epizy.com/venture_capital_funding_report_q1_2018_pwc.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/28624899277.pdfIn PDF document text
    • http://solazagu.epizy.com/mammals_reptiles_amphibians_birds_fish_worksheet_ks1.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_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 5176 bytes
SHA-256: 4abfbb04e29423aa0d2e628affe9f367ab9caecd006dc1babcc78cfbb61d1129
font_01_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 11988 bytes
SHA-256: ee9369536eff6938e564b8890b50c78327265336a8f242f14508f71c0752cd1e

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