Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecff3a25810ba1c…

MALICIOUS

PDF

69.2 KB Created: 2021-02-19 07:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 29b405feb0212fc7ee1b2a3066131816 SHA-1: 680e02986d30bb70678512853a2c899367c713e7 SHA-256: 6ecff3a25810ba1cde78254308c66557fcc476a5399ecf2c0cfcf985e8dabc0d
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=bread+cutting+guide PDF link annotation
    • https://cdn.sqhk.co/jategumeb/UdvWjch/wezobizemudonusunefi.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/jdggWie/video_call_online_apps.pdfIn PDF document text
    • http://saudiautoinsurance.com/what_does_the_word_darling_mean_in_spanishnhra6.pdfIn PDF document text
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/tekatil.pdfIn PDF document text
    • http://begdas.space/air_conditioning_and_refrigeration_rex_millerlj3oe.pdfIn PDF document text
    • http://kawlites.online/mekexowiliwipakereghh60a.pdfIn PDF document text
    • http://odemebayisitrafik.com/labilokiwumefimibhaxb.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/c95c11e3ba4a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_6013bc58cb04f.pdfIn PDF document text
    • http://freshnatur.fun/921097521866p6uu.pdfIn PDF document text
    • http://normal-id.com/puralaleml2lrp.pdfIn PDF document text
    • http://naturebiolog.fun/jajojah7mm.pdfIn PDF document text
    • http://wellwork.site/kumozuk3rddr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_6008263ca62cb.pdfIn PDF document text
    • http://thelandofbadideas.com/88746087527pkrv5.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/6666507.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/jhF4Uyp/online_javascript_compiler_debugger.pdfIn PDF document text
    • http://rte-ita.fun/greater_than_less_than_worksheets_grade_5vxxn4.pdfIn PDF document text
    • http://kupivse.xyz/cardan_jointe47nc.pdfIn PDF document text
    • https://joriwonakogilul.weebly.com/uploads/1/3/5/3/135305945/wadosiw_lugebomuve_fakojojodaduj_xefes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://medlineplus.gov/recipes/breads/In 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_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 4944 bytes
SHA-256: 692307a6869a602e3451c6a94b684fbacac2236c387834545bf39ffd0867acee
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 10192 bytes
SHA-256: e64e53105b4b985d01685c8c062c6bcdf9daa7cd39e80d91b6a173b42bb29711

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