Malicious PDF — malware analysis report

Static analysis result for SHA-256 014fec8bbebf497e…

MALICIOUS

PDF

74.1 KB Created: 2021-06-04 16:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c24143f958a25f11bdd40cdb4b6911e8 SHA-1: bff1bfd227d5b59b033a8b72117c6954a75ffdec SHA-256: 014fec8bbebf497eb83d450949eb119915b5be0e456459dfa5c45d88e24086d5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting and are used in a link farm, indicating a phishing or malware distribution attempt. The primary malicious URL identified is https://smidgel.ru/pbw, which is likely used to deliver a second-stage payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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://smidgel.ru/pbw?utm_term=to+kill+a+mockingbird+vocabulary+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386087/normal_60b95a546ce4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_605cb1b7215c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_602820dd663f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600af06c75a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_604f2fbfd9740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_60157ed2b9010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5ff5083d28106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_602d9c47bc83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_605255dedd374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144533268/kemovadafokip.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/33039224375.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144466356/curses_hexes_and_spells_daniel_cohen.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/what_are_the_duties_and_responsibilities_of_human_resource_management.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144515064/how_to_build_a_mob_farm_1.16.3.pdfIn PDF document text
    • http://ronakiko.pbworks.com/f/rawedoxibotak.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/how_to_find_commonlit_answer_keys.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/solution_manual_engineering_mechanics_statics.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144609357/25018830696.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144441807/guxozetuge.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144443073/55347326113.pdfIn PDF document text
    • http://jufugoxula.pbworks.com/w/file/fetch/144603270/melatusuwuna.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144448071/venice_beach_shark_teeth_chart.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144562002/78403658356.pdfIn PDF document text
    • http://mokapuv.pbworks.com/w/file/fetch/144612948/handbook_of_nonprescription_drugs_19th_edition.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144439860/vazip.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144456384/primark_sizes_big_or_small.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427536/45912688179.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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5760 bytes
SHA-256: d7d5ddc3b8e0ad68a3c447a98edac49aece279272dc7e4a224ce8bbcc8d79cdf
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 9720 bytes
SHA-256: da361b705be8588ed78438b9fac0571ff19df3d8b967e4603067819e2fbfbf8e