Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e83deb191fa4312…

MALICIOUS

PDF

71.1 KB Created: 2021-02-22 10:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a770da3f69902df4092433af17c1a209 SHA-1: f3380fc026c04af02a6e48ec04d78805ae4a3b3a SHA-256: 1e83deb191fa4312a729b2e7c413bd47d710e85168cd01095c0f74febc9002be
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically noted as an external URI pointing to 'druttle.ru', suggesting a phishing or redirection attempt. The PDF structure and the presence of multiple links on disposable hosting further support a malicious campaign, likely involving spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=dnd+dice+roller+app PDF link annotation
    • https://cdn.sqhk.co/jabakujivim/a6rhhic/tejeselax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fd15cf649025.pdfIn PDF document text
    • https://jamekefexufi.weebly.com/uploads/1/3/4/8/134866820/zuwaforej.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/79149627859.pdfIn PDF document text
    • https://cdn.sqhk.co/zewesifadeka/bkhaGgh/toolbox_for_minecraft_pe_1._16._100.pdfIn PDF document text
    • http://hookup157.site/pevam4id64.pdfIn PDF document text
    • http://djami.ru/bacillus_licheniformis_atcc_14580m7gj2.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/eddz1gc/share_files_via_icloud.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/edmentum_answers_english_11rgyk9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fcaf7ffc72f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/balance_sheet_example_ib.pdfIn PDF document text
    • http://pejatopofir.rf.gd/53195412473.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/bluecoat_proxy_interview_questions_and_answers.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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 4888 bytes
SHA-256: ae75b9aacc4b0736d95dfeaa6e7f01749afe0f3dc9495bfa8e5ed846d0e30066
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 10556 bytes
SHA-256: 26689dfd640660fef877babfed7c2f9f925df4be3e5122a57f41b121b012fef4

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