Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef6f8a6b690a41e…

MALICIOUS

PDF

153.6 KB Created: 2021-01-18 06:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 81dc9138585b46e18d18432fb94d9ef8 SHA-1: 5efe969cdd235f647a197b1b56ffc064f6d64e3e SHA-256: 5ef6f8a6b690a41e0c2a07783ded0c73a73999f1c36c112d229446175c3f174a
184 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'traffmen.ru'. This URL is disguised as a download for 'industrial safety engineering notes pdf'. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, but the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/wb?keyword=industrial%20safety%20engineering%20notes%20pdf In PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/bipolar_transistors_database_apk.pdfIn PDF document text
    • https://site-1175201.mozfiles.com/files/1175201/james_bond_gun_barrel_template.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/5028834.pdfIn PDF document text
    • https://site-1171687.mozfiles.com/files/1171687/33460813524.pdfIn PDF document text
    • https://zunenora.weebly.com/uploads/1/3/4/7/134713213/3eb0040e71.pdfIn PDF document text
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/lusamugefedegaz.pdfIn PDF document text
    • https://site-1176114.mozfiles.com/files/1176114/old_man_s_journey_xbox_one_review.pdfIn PDF document text
    • https://rizaxulizogi.weebly.com/uploads/1/3/4/7/134753796/tuzim.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/jcaU3Nw/megan_is_missing_full_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/gcugeGx/magnetic_chess_set_near_me.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/zotanuj_falerasi.pdfIn PDF document text
    • https://site-1175507.mozfiles.com/files/1175507/98206876663.pdfIn PDF document text
    • https://site-1178617.mozfiles.com/files/1178617/builder_games_2020.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • https://s3.amazonaws.com/vaxebisapesi/agni_devi_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/adiga_adiga_video_song_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/letters_worksheets_for_kg1.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000203a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203A6 1944 bytes
SHA-256: 426ee0de65c63de1e0eb6cecf57b9a4a8a63979f390993b69e57df9636ff0072
font_01_sfnt_off00020cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CDC 5132 bytes
SHA-256: 9e2f34b2c7d8b77595fd4cfc2039e4acfe89d02d7d864783ddc41e8c4f156450
font_02_sfnt_off00021e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E24 1188 bytes
SHA-256: 528517ee321d90cd9098c30607ba699bccbc33d7f08c1dc276c8d66f9e8d454e
font_03_sfnt_off000224f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224F8 10780 bytes
SHA-256: e55c031a8dcb61e6502ea85e81dbb0dd9474776563201b87d14ce7e255bfc820
font_04_sfnt_off000249b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249B5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34