Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb15bafea2d65a…

MALICIOUS

PDF

70.6 KB Created: 2021-02-26 13:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8ae107344e4c1dcd7501e8b156d31614 SHA-1: e6f496f2db4a5f88a7cb842083599e1ff4bae7f4 SHA-256: 3fbb15bafea2d65ad599f64a70ddee69d103ab7230062e8a7aabdaee21df3786
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious 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://botokaw.ru/123?utm_term=schweser+notes+cfa+level+1+reddit PDF link annotation
    • http://jekefidaz.mygamesonline.org/62951463501.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/rojununig.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/f3cc0e2047b90.pdfIn PDF document text
    • https://vijuvunido.weebly.com/uploads/1/3/0/7/130740607/pimibovasaremo.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/att_digital_answering_system_dect_6.0_manual.pdfIn PDF document text
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/01fd9.pdfIn PDF document text
    • http://suluxigexu.22web.org/reazione_formazione_solfato_di_ammonio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zerakunutage.epizy.com/cyanogenmod_11_boot_animation.pdfIn PDF document text
    • http://talaxapu.epizy.com/inequalities_worksheet_grade_9.pdfIn PDF document text
    • http://ditiziwux.rf.gd/65392029700.pdfIn PDF document text
    • http://tuxesoguzegisox.epizy.com/atom_untuk_linux.pdfIn PDF document text
    • http://nulesuli.epizy.com/wrong_turn_4_hd.pdfIn PDF document text
    • http://lojosikol.epizy.com/carnatic_songs_lyrics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 5204 bytes
SHA-256: a864b1e15d426adfad206c6ba2c972297c4852bf0baafdd877094423904dc8cf
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 10704 bytes
SHA-256: ffec1823e8da20bb8a176b1216bab6849bb483872b8a0e9a997a8baba4f5eaac
font_02_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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