Malicious PDF — malware analysis report

Static analysis result for SHA-256 110eae474cdf8bb3…

MALICIOUS

PDF

72.8 KB Created: 2021-03-18 13:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4eeb43fed14fb34c9cc85977de2ebef5 SHA-1: 74cec737095ba65f212786c4b64c35b2bcf0800f SHA-256: 110eae474cdf8bb33618db96033e6b1a9b536336b5334270bfd1b9baa0019759
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to credit reports. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=credit+report+scenario+worksheet In PDF document text
    • https://cdn.sqhk.co/nemoludajedu/Kz2icgg/15425056559.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/ridegadilefolomoxuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_600fbbf85e4f8.pdfIn PDF document text
    • http://helpcreditscore.info/rick_and_morty_pocket_mortys_mod_apko0uh9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5ffbb36fe6182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ff638c1e2f13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_60178cb812078.pdfIn PDF document text
    • http://ourfanz.com/are_be_pressure_washers_any_goodhudqk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_6016478aa2ea4.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/XhhiaxR/35722930604.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/jjBFezO/fixuviminaxusaguv.pdfIn PDF document text
    • http://wavulefarunatev.iblogger.org/bluestacks_free_for_ubuntu_16._04.pdfIn PDF document text
    • http://brosbass.com/pijimalenagajewulurizolnv116.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/ashrae_62._1_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/dghd6gg/vefovubadezumekirafefi.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/jbwHii5/jungle_animals_coloring_book.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/fuzubokaxiroxaxun.pdfIn PDF document text
    • http://maska-respirator.com/64070431939jw5zs.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/ij8G8TO/cloud_raiders_neopets.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/hihayhm/retroarch_core_updater_not_working.pdfIn PDF document text
    • http://axecheat1.xyz/prime_numbers_1_to_1000fkpqw.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/0iihgJZ/digital_marketing_diploma_jobs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revuzulikasulo.epizy.com/business_letter_writing_exercises_with_answers.pdfIn PDF document text
    • http://lisokabosexipep.epizy.com/kuzodelesuda.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/pabosajixubalib.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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 5192 bytes
SHA-256: 59df55f9894f12dbaa1cbdfc69a58719e0c99c64e7298fb5bdef926106ba8228
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 9764 bytes
SHA-256: e6dc7893fd73b800472a44fa4c98e394974990375def1aaad863765d7338a8e2