Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcbf788dddbd200…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 23:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5574972beeb6adfb5beccee50966f157 SHA-1: 4dd93d1f930bc3dde39436320d0f4b7e8c99e668 SHA-256: bbcbf788dddbd2008f0704fed587fe40795edb8ff4cf8aecacfc4113aefbb4e4
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to suspicious and disposable domains, masquerading as legitimate documents. Heuristics indicate it functions as a link farm designed to redirect users to malicious content, with one critical alert specifically identifying it as a viral-video clickbait lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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
  • Viral-video clickbait PDF links to suspicious host critical SE_VIRAL_VIDEO_CLICKBAIT_LINK
    Document uses viral/leaked-video lure text and links to a suspicious disposable-looking web host. This is a clickbait/traffic-scam carrier shape rather than a benign PDF link.
  • 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://jottigo.ru/wb?keyword=how%20to%20study%20linux PDF link annotation
    • http://social-whisper.ru/hibiscus_petroleum_annual_report_2017n6x7y.pdfIn PDF document text
    • http://grenkasalo4.xyz/lepiti9j14z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fdd2fd146983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_60413b802d004.pdfIn PDF document text
    • http://luminar2-download.xyz/narojelemomurujekukygdx.pdfIn PDF document text
    • http://aires.fun/triangle_offense_basketball_drillsvfg8a.pdfIn PDF document text
    • http://podarokinsta.online/voxuvajakaxfm83j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fd0f39021fd5.pdfIn PDF document text
    • http://believes.space/wozenalorikomimetuxawxmov.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/playable_races_warhammer_total_warw60ev.pdfIn PDF document text
    • http://fimewot.xyz/public_relations_internships_los_angelesev72s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_6005582a8a4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_60214d52c8954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd7a769a55f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6034d20d9abb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000eee2.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000eee2.bin)
    • https://uploads.strikinglycdn.com/files/30f539db-18ca-448e-a48f-002077d92343/making_money_on_tiktok_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3036ca6-bdb9-48c5-af3f-e4e286da4f3f/parking_near_fire_and_ice_boston_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ce95b9-fc85-42ec-a3e4-fd3673f1dc8c/how_to_reset_swann_dvr_88075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13084cfd-3563-4706-9b70-d4ad2a00ecf7/lurafitapeneji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9423d2c-f378-4470-b717-687d77564a4c/bizugobakaxaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54eebaa2-46cf-40c0-aec9-c6a2d0150a24/38578735365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9588acf-1339-4f8e-9121-8ce915eb4369/traxxas_tqi_transmitter_throttle_reverse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830d051f-045e-4bd3-ab6f-c514074d1ad1/ligejokuwemumena.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 extracted file (font_00_sfnt_off0000eee2.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 4736 bytes
SHA-256: 48726ea447484233e4986bb5f41d4a95ebfe4a79a3eb41133e1661b11bcd3f94
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10772 bytes
SHA-256: 3121dbba6d3148404747d43ca80aea14ef6154375f61d320affa0bf39cd57874