Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f454cf0f6c7bd8…

MALICIOUS

PDF

65.3 KB Created: 2021-02-21 06:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 630d6fe4737b7dc5f2cc51952ffc2185 SHA-1: 900d36714863860c48acc4c542e31f52473b7020 SHA-256: f5f454cf0f6c7bd89ae46eb83d74b1d98b1dc56b2a1365aa57a3d47c6675052e
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure for 'Kakeibo pdf free download', indicating a phishing or malware distribution attempt. The presence of numerous links to disposable hosting further supports this, aiming to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=kakeibo+pdf+free+download In PDF document text
    • http://edalovert.xyz/zovanatudov8cjh0.pdfIn PDF document text
    • https://cdn.sqhk.co/xosujopi/b2f00hd/werujaduzanebavazaxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_5fdb8f8977f5f.pdfIn PDF document text
    • http://antinomi.design/47550574817beqqg.pdfIn PDF document text
    • http://shoppermarket.online/174072468361bkb7.pdfIn PDF document text
    • http://tipaxoj.66ghz.com/kiwepigif.pdfIn PDF document text
    • http://nicepics.xyz/xezogodigs88pf.pdfIn PDF document text
    • http://lokogosomezik.iblogger.org/bitdefender_free_for_android_phone.pdfIn PDF document text
    • http://watertea.space/74532302506zjhdf.pdfIn PDF document text
    • http://bajemafo.iblogger.org/hard_bass_dj_song_2018_pagalworld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jerovewoxisabu.epizy.com/fagimelifigosojuxipu.pdfIn PDF document text
    • http://lonuduvikis.epizy.com/fluke_115_multimeter_datasheet.pdfIn PDF document text
    • http://nenilezum.epizy.com/crc_brake_cleaner_safety_data_sheet.pdfIn PDF document text
    • http://xuvezes.epizy.com/kuxazisavobexe.pdfIn PDF document text
    • http://dunipuxok.rf.gd/cursive_writing_worksheets_abc.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_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 5120 bytes
SHA-256: 5844e9e43e23045965594956c391ba391f0a2fbb93fef11d68e852e8ae5d11c5
font_01_sfnt_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 9936 bytes
SHA-256: 727f77f80f2848d3488ead6fceeedb8b58a32c07da32b116f2632af7deee4211

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