Malicious PDF — malware analysis report

Static analysis result for SHA-256 e861e3e306c89eb2…

MALICIOUS

PDF

87.2 KB Created: 2021-04-25 13:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5405ccbdcf9e0673f208ae8961f5b35 SHA-1: d37e56ec6b29cc56a058062d6cc6b5c1a9b66bd7 SHA-256: e861e3e306c89eb25ab2ba758eb792adfee157e59540b3fbe028f2317481945e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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/strik?utm_term=acer+chromebook+15+cb-3532-c3mx+15.6+inch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458145/normal_6054f93052d3c.pdfIn PDF document text
    • http://bonboxstudio.com/principles_of_mathematical_analysis_3rd_edition_solutionslyv63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fd902241f6af.pdfIn PDF document text
    • http://copyright-notice-ig.com/69408027375qxe9b.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/khafCih/top_10_arabic_songs_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_603e252a4bc52.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/ghfvOif/26424463092.pdfIn PDF document text
    • http://ilook.market/54074372969wcrw2.pdfIn PDF document text
    • http://bigtittybella.com/ligopevikutuvugujutubrufr.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/ZiabUy6/rolling_sky_2_apk_data.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/bizamesuwepe/cccam_2019_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/2846459290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007633a9-c6ea-421b-a69c-668e38bbffdb/true_to_the_game_book_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b9ee05-b3f6-4995-bbbb-aa727b8d248b/xedikupeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6ee172-a5ca-4c7d-9e68-9d8e53e71bae/2017_ford_ranger_2.2_towing_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c65fa5-381a-44a3-bad3-93cc5ad756cb/gozejagi.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_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 5572 bytes
SHA-256: 41f624bb2e08921f65bf25906994dfaf4c25f9b9d79f0e4d9186f4702dc8f057
font_01_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 11968 bytes
SHA-256: 484960b47b938188e556d78a3956214bb0e567bc96f1cec45d5c1e5532c48321

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