Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33c7e729d94feec…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 13:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a3e87033cf15486f24878fa640faa88 SHA-1: 10957e671022dc3147f6295ff379cb0c6d8f3d41 SHA-256: b33c7e729d94feec1d932360cc3c37576dbb3be7d851e966fa8aab8d01dfe800
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=how+to+put+together+diaper+genie+complete PDF link annotation
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/lusubalaxarepuzizuk.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/govuwokon.pdfIn PDF document text
    • http://smcjd.com/dbt_skills_for_adolescent_handouts4s1jy.pdfIn PDF document text
    • http://ipai.online/bopevetafonalhetea.pdfIn PDF document text
    • https://xipuzitob.weebly.com/uploads/1/3/4/5/134523495/404d2.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/4444477.pdfIn PDF document text
    • http://carishr.com/what_is_cooperative_federalism_characterized_byzesq2.pdfIn PDF document text
    • http://copyrightsupport-ig.com/what_is_caps_for_sale_aboutps96o.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/kivusene.pdfIn PDF document text
    • http://walkover.me/tu_mundo_espaol_sin_fronteras_second_editionworry.pdfIn PDF document text
    • http://mon-compte-cmb.best/199864139295mu6g.pdfIn PDF document text
    • http://smirno.life/43944147135hff4d.pdfIn PDF document text
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/4928263.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/jikosinizibez-kukemobesulopod-goruxedag.pdfIn PDF document text
    • http://putinoid.ru/pubuvuzigomalaguxepimiboar5x8.pdfIn PDF document text
    • https://gavuzamamezi.weebly.com/uploads/1/3/4/5/134590232/xunesijojajapa_vezok_mafixewetav_talewujotafi.pdfIn PDF document text
    • http://webmastervlad.ru/981574214hv1d5.pdfIn PDF document text
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/kokerawelujuxemo.pdfIn PDF document text
    • http://zoneeuro.pro/what_does_pearl_mean_in_the_bibleooaln.pdfIn PDF document text
    • http://nominasacra.ru/practice_sheets_for_capitalization_and_punctuationwwof3.pdfIn PDF document text
    • https://bamewubi.weebly.com/uploads/1/3/2/3/132303354/9277724.pdfIn PDF document text
    • https://lokawerimi.weebly.com/uploads/1/3/0/7/130776865/tadirixun-ximoxazujafazis-zoxisupagiperig-bemimugubifitab.pdfIn PDF document text
    • http://artdebug.site/poxufewalevepolepocsiwu.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/bb4ccb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 5364 bytes
SHA-256: f2f688b2fffb11fda296d8e86d675d7e83706c458a3b02f7624d8d3d0594f778
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 11248 bytes
SHA-256: 66029220b01a47c7609aeca1d6d479ccffba9dc70e7f93b2ccea9f7151ba497a