Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8bfb281a5c47ed…

MALICIOUS

PDF

78.3 KB Created: 2021-01-30 05:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea2f5f25956b13880aa04368b2dd7e6 SHA-1: d9bb311282cd7c49a546ab2828f989723098c97b SHA-256: 9f8bfb281a5c47ed288e046013c2f5a3fd8a9998e6682269c4e20a23dda73776
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'Blender free 32 bit' and application metadata, indicating a potential lure to download malicious software or engage in phishing. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=blender++free+32+bit
    • https://cdn.sqhk.co/zafupusapun/ejfyojh/first_100_words_for_toddlers.pdf
    • https://cdn.sqhk.co/rowofabuf/iiedg1C/nugabewa.pdf
    • https://cdn.sqhk.co/xogovofofi/8ESVvic/redepewebafogoru.pdf
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/0a23953.pdf
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/felakaxuvi.pdf
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/972865.pdf
    • http://gutprod.xyz/wotidotso6sz.pdf
    • http://gesabagipo.22web.org/cechy_podzielnoci_liczb.pdf
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/terezagovugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gikisomu.epizy.com/koruzabizuve.pdf
    • http://bezofiwod.rf.gd/chemical_bonding_notes_iit_jee.pdf
    • http://towupew.epizy.com/on_job_interview_questions_and_answers.pdf
    • http://rubijisezet.epizy.com/acceptance_letter_for_school.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f769.bin
65345f1844d0131f947bc189109b25948f9e65dfc0c7cff67e9e89990c09584e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 4996 bytes
font_01_sfnt_off00010878.bin
e69d8e3a5b6dac1fbcd24e1fb900a49f99f88debf9b60e9b0acde61cef8151d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 10688 bytes