Malicious PDF — malware analysis report

Static analysis result for SHA-256 709762bb45ea1ab2…

MALICIOUS

PDF

74.0 KB Created: 2021-03-28 11:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c4d17a3c6818557d05b93a2b5b1f3c74 SHA-1: 9ef294cd1f1e60c88d5e0e432366a6caa1e3af21 SHA-256: 709762bb45ea1ab20af13dea2141183242937ba546e75dbb559a36dbc6fc66f8
234 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malware. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'password-protected archive lure' heuristic further suggests that the document is intended to trick users into downloading and decrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=runescape+07+barrows+guide PDF link annotation
    • http://tudetiva.iblogger.org/water_booster_pump.pdfIn PDF document text
    • http://idealicaitalia-official.site/fall_stardew_valley_best_crops8zztv.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/Fidhgx1/std_10_science_navneet_in_gujarat_ncert.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/bjcn1ge/nudefefiwowosa.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/fhbqijb/thinking_skills_assessment_oxford_past_papers.pdfIn PDF document text
    • http://pollsexpert.com/59014313191mkmu3.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/foxagowasuwavademezivesguy51.pdfIn PDF document text
    • http://bossyonlinex.com/852816861336nl7.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/zalijopuzarobotesig1oju.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/iJhiHif/53616020192.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/heTLGgd/how_to_become_a_kindergarten_teacher_in_georgia.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/ngihhif/for_freedoms_congress.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/free_avery_template_5267ceaiz.pdfIn PDF document text
    • http://swiss-gear.store/950481547607avw.pdfIn PDF document text
    • http://stonersfranchise.com/chevy_nv4500_master_rebuild_kitn1qv8.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/dSieNIn/58179967139.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_78bf58eb93b844a7ab42363b32b52429.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_ccd4250d959f4ba3ac46cc5539452862.pdf?index=trueIn PDF document text
    • http://rojegasofibi.epizy.com/92069974980.pdfIn PDF document text
    • http://gisipevuzugofij.epizy.com/oxford_bookworms_stage_starter.pdfIn PDF document text
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_7dc1d54ffccd4494a99c0e309a0ee219.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_703548f70da940b59e9fd247d6e2434e.pdf?index=trueIn 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_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 5668 bytes
SHA-256: 9397e5a0f0823b50fa68146f414af765ebd4ed1c2b9643c0988718bf1fb0b759
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10672 bytes
SHA-256: cd2a73a3feaafcb728f40a65211098b0936ecdce2077f86140c2f922abab27f4