Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc70995661374a3…

MALICIOUS

PDF

68.0 KB Created: 2021-03-19 16:29:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a8e7e8101cca651504478eb0631b533 SHA-1: e3bca2f4de11a4a7835316dea0443810078a6900 SHA-256: bdc70995661374a38f23f02a9077588e2fef514d0c33a5f81c8e97af520bf862
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate this is a malicious SEO link farm hosted on disposable domains, with ClamAV also detecting it as a phishing trojan. The primary purpose appears to be directing users to potentially malicious or phishing websites.

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://baarspo.ru/123?utm_term=burj+al+arab+photos PDF link annotation
    • https://cdn.sqhk.co/tevimuwijile/jdpSidS/58899761582.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/nhjfihr/sim_dashboard_pc_monitor.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/hhy5pgj/kifoz.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/ajiMjjX/vugegivuligabilizoduzulob.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/devetajupofewupoda.pdfIn PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/648881.pdfIn PDF document text
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/foxurilamumodesujog.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/HiaVnij/bosch_serie_4_wan28280gb_user_manual.pdfIn PDF document text
    • http://yandex-delivery.cc/propaganda_bernays_amazonpacow.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/iY8l6jd/wrestling_revolution_3d_real_names_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/hfaeih3/4270932226.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/9118979.pdfIn PDF document text
    • http://biolinkus.me/architectural_design_brief_reportf95m0.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/03709a513.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/fMgfh6r/76760421710.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/bovokagajezuwalapur.pdfIn PDF document text
    • http://rating-bookmaker.ru/xuseninipizuxio5b9e.pdfIn PDF document text
    • http://899themes-demo.ru/educacion_prehispanica_en_mexicojqu4m.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/he9jghc/12127040430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8add58e9-a8cf-4888-bb19-e6ce746878fd/49003732655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12afecb3-074d-4dd4-80ab-70a8bedf3f41/lasadovalupiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac76fc27-313f-4984-ae58-925aedc6ff6d/exercises_on_simple_compound_and_complex_sentences_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c77eb1-5c2a-408b-a0ba-fad13ca45a51/suzopipowujujit.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_off0000ccc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 5172 bytes
SHA-256: 58ad44f8856ef32fcceb3badb160cfb710a387a7ad05a23fa6793c9515b57b42
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10660 bytes
SHA-256: dd8fd829243660d4ce3ba6b8256bf352303d28a290186703b56ccc2a3cdb0f69