Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3a55e53c13c15…

MALICIOUS

PDF

71.3 KB Created: 2021-03-24 23:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4bbb5c0a3ac7fc034851126402e7b949 SHA-1: d83c2b64e1eb8b434bc081095cc5e3a388061e44 SHA-256: c8c3a55e53c13c15a73fc2d1a739870129259f7e2b1a09fd9bb0f77204717b10
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI that redirects to a URL designed to appear as a search result for 'williams intermediate school phone number', likely a lure for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

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://ponafet.ru/wix?keyword=williams+intermediate+school+phone+number PDF link annotation
    • http://wavolat.iblogger.org/battlefield_1_apk_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_603870f9bf2b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_6039d2639b6db.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/android_interview_questions_on_sqlite.pdfIn PDF document text
    • http://dodapim.22web.org/benny_and_the_jets_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_603b5eb0d313c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadezofoxamar.rf.gd/working_principle_of_buck_boost_converter.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_777ecfa4052846c09b3d421f62d5eb6c.pdf?index=trueIn PDF document text
    • http://dupopat.epizy.com/fotosikej.pdfIn PDF document text
    • http://jolatuziguxobe.rf.gd/84688087983.pdfIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_debbbf02744b4f4e9c6e647297c15276.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_42f33583f068488c987eb58f5f67603f.pdf?index=trueIn PDF document text
    • http://wawutanow.epizy.com/liturilino.pdfIn PDF document text
    • http://xabogubumux.rf.gd/zabosibofototitimodiw.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_3f3863d2ede4411db5196e19eb3bc465.pdf?index=trueIn 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_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 5468 bytes
SHA-256: 18252c2b54524be0b0aeda50cbc2836431a455c4540bd4e0d25c983e7b2d6227
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10508 bytes
SHA-256: c48c46899aed5cde73d7a0e5e3e61176a558f2f8446539b1c82d0f2bcfa97dd7

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