Malicious PDF — malware analysis report

Static analysis result for SHA-256 5635ae968f4a2aee…

MALICIOUS

PDF

89.4 KB Created: 2021-06-11 09:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 46d60fb528022a5c7e70225606582ac8 SHA-1: eb4b12189db52c3315453482d68e50478c99d01a SHA-256: 5635ae968f4a2aeeb721bad9ab6dda8138b1fabf3099ba6c3faaa324941f928c
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used to host malicious content or redirect users. The PDF structure and embedded content suggest an attempt to disguise malicious intent.

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://cructi.ru/pbw?utm_term=fast+praise+and+worship+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60ba44ab931d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_6064bf2a6ae36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459028/normal_5fc5db1638cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_60c2470b90650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5fd3d3366d346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144584022/oxford_science_dictionary.pdfIn PDF document text
    • http://labidan.pbworks.com/f/20972096483.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/f/16231905366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3562a4-8d36-49f4-ab6c-e5f135a9af81/delta_band_saw_28-180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6107a624-71b0-431f-819a-3882685e9020/88262902423.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/f/nopuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696047e8-d2e5-49d6-b760-d517c84ff377/proform_505_cst_treadmill_2014_model_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a885db-61d9-49e7-8c33-e4fd00aa8de4/ligokenopidak.pdfIn PDF document text
    • http://feselikebapu.pbworks.com/f/luneno.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/77174810883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0aa73e8-b065-4924-a309-99274de603eb/39365767860.pdfIn PDF document text
    • http://wipadewor.pbworks.com/w/file/fetch/144669855/71721416283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac24fa1-c570-4766-ae55-53248f2abb42/seladoloboda.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_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 5236 bytes
SHA-256: 42bece2c04cdcc0de3646389d70270e12a83c6a2b3dbde1c623a7a85fa208a1c
font_01_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 11792 bytes
SHA-256: b39ad95695dc78ec3eb7c65fbf180105280ac299fd4295496417b34bc04694d5

Open this report in the interactive analyzer, or submit your own file for analysis.