Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94af43668da680b…

MALICIOUS

PDF

82.0 KB Created: 2021-02-06 18:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d6ff2101cc8caf978bf0efdd184f37a2 SHA-1: 3f6fe2f1f6a5b1aa0edd8c88e12097a2f0d54d23 SHA-256: e94af43668da680b01bfd6cb885f1fb0a899dbb7bc01a17ea61e12b70b8b0044
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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 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.
  • 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/aws?utm_term=adobe+indesign+cs6++for+windows+10 PDF link annotation
    • https://jobeluke.weebly.com/uploads/1/3/5/3/135318189/90045afa4610ac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_600648a9e8a79.pdfIn PDF document text
    • http://faketikus.22web.org/ragab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_5fd33da4518db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5fd099bd85447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff490eb65d56.pdfIn PDF document text
    • http://gigewaxupupixe.22web.org/identifying_independent_and_dependent_variables_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_5feaf75d794d8.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/sesafefanulokam/huawei_bootloader_unlock_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/anganwadi_recruitment_form_in_haryana.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/96433920104.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/97264156504.pdfIn PDF document text
    • http://kobepok.epizy.com/63200936213.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/careful_verb_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/guest_book_sign_in_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/missing_addend_worksheets_second_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/24514812904.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/59058239375.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/hasbro_guess_who_character_sheets.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000116e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116E3 20744 bytes
SHA-256: ab50bfd0c35dcc81e84fd06bc4cde8e8686315e10ea4cb63b92c47dd3e3ff9db
font_00_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 5516 bytes
SHA-256: c27fc8aa18c6a63253bc5cd7e75578f6e055b85f54eee58270a35e44f3f3a1af
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 10228 bytes
SHA-256: 61665030753de8f198360935cad8453a3150a93fc8c8e9cb2d3a05fc0054d93b

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