Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e20cbf1b304ad8e…

MALICIOUS

PDF

72.4 KB Created: 2021-02-17 01:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 30a10499d476b7d7986682649f737a3d SHA-1: e2b6e23548f15396bdc1d165430a8fa984a27257 SHA-256: 8e20cbf1b304ad8ea83c2bd1b490d9803e2bed95aacecbd12e55893d69f3831c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious websites, with one URL explicitly mentioning a troubleshooting query. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack to drive traffic to external malicious sites.

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://maypoin.ru/123?utm_term=why+is+sketchup+3d+warehouse+not+working PDF link annotation
    • http://biomaniix.website/sirikuzileturulaviradijowdohyk.pdfIn PDF document text
    • http://dragonflysagewellness.com/rutefajadazabejudupazu7r3bq.pdfIn PDF document text
    • http://buliwomof.22web.org/catalysis_letters_guide_for_authors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_5fd3a1e38ec71.pdfIn PDF document text
    • http://easy-money-cash.space/14461784688ftnpz.pdfIn PDF document text
    • http://myluckywin.site/burgerville_menu_nutrition_informationtl89y.pdfIn PDF document text
    • http://boxberry-24.cc/14_day_keto_meal_plan_free26dqd.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/vorizakixosavipom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zumaxupuvu.epizy.com/53678095291.pdfIn PDF document text
    • http://kimizajoveso.epizy.com/59247297533.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/81496163410.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/administrator_password_recovery_software_free.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 5740 bytes
SHA-256: 10f70c54920c9f3ca48fac7ed608bc35f5b173cd306d7ae6ae33dd438554650e
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 11084 bytes
SHA-256: 59d0f5be9e7066fb25510b0e87e500613f9658161dc6e3e4de8284ead4cacf58

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