Malicious PDF — malware analysis report

Static analysis result for SHA-256 acae987b9ec2f626…

MALICIOUS

PDF

158.7 KB Created: 2021-02-21 08:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d5a533603b73882037f8936b9d1574c4 SHA-1: 21cf76cd3261715c7764f0d4b42b70f6f63b5c70 SHA-256: acae987b9ec2f62665a37ba97c637ee627450927e4170bf3bcdd611bb73d83cf
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to a 'book order'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=horus+rising+book+order In PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/xirijijoxosen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_6025f890d6cfe.pdfIn PDF document text
    • https://galidenik.weebly.com/uploads/1/3/1/8/131856819/zanulakagakukebono.pdfIn PDF document text
    • http://wowosuseje.22web.org/lagu_ayasa_the_reason_why.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369903/normal_6004b5ff251b3.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/lawedew.pdfIn PDF document text
    • http://waramejejit.22web.org/garog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5febeaaba5c85.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hhhgjSa/wild_blood_apk_uptodown.pdfIn PDF document text
    • http://wixiziz.iblogger.org/77741787182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobavaduxa.epizy.com/between_the_sheets_book.pdfIn PDF document text
    • http://fuxivupinamipi.rf.gd/xakijiredezogupoxare.pdfIn PDF document text
    • http://godidab.epizy.com/infectious_colitis_treatment_guidelines.pdfIn PDF document text
    • http://karifopiti.epizy.com/excel_2013_manual_calculation_default.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/jezodeni.pdfIn PDF document text
    • http://banobozibijur.epizy.com/15833963278.pdfIn PDF document text
    • http://padezaj.rf.gd/meet_your_spirit_guide_meditation_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_off0002330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2330A 4916 bytes
SHA-256: 927f9f8e73b13ef41c4ce2a79e648138e584a0b7d6e8211a5bd9eed3e46c4a03
font_01_sfnt_off000243cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243CF 12212 bytes
SHA-256: 28247ba0e58149bb64d5ee924a8ff0b2bb1a8e363c57af26778e952b64cfeaef

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