Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9506ca889022fc…

MALICIOUS

PDF

69.2 KB Created: 2021-01-31 10:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c129ad52e6ddb66c5b455631c4ae0a2c SHA-1: bb833de239159b4fc44b92b477c4494aa1297a17 SHA-256: 2b9506ca889022fcb12cf5beb61de094cb034597ceb3c25361ce4f5072828dcb
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDFs hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential phishing or malware distribution vector. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://crophysi.ru/wb?keyword=teleportation%20spells%205e In PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/gopitafejur.pdfIn PDF document text
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/9934419.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/poviwetojugun.pdfIn PDF document text
    • http://kefipipina.22web.org/rascals_2011_movie.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/wosivebilajur.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/burud.pdfIn PDF document text
    • http://fufulizirexub.22web.org/sudurituzukarenefuxa.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/dutax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanozetodane.rf.gd/arthritis_research_uk_shoulder_exercises.pdfIn PDF document text
    • http://luwegovufa.epizy.com/balance_sheet_analysis.pdfIn PDF document text
    • http://fakipewoze.rf.gd/kekozezekapadog.pdfIn PDF document text
    • http://dowupozor.epizy.com/yale_mba_employment_report.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/91423406241.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/subject_and_predicate_worksheet_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/mesarewun.pdfIn PDF document text
    • http://sesuvuruv.epizy.com/20271272132.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/94153118181.pdfIn PDF document text
    • http://mekavebij.epizy.com/roboturixizozizofoko.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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 4888 bytes
SHA-256: 702be08e47abf0cc1572a29d2d6977621f8570347d19685ff6293824a9bd046c
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 11316 bytes
SHA-256: 19ca151678d68a2c2d2602fdd01e3006d7279dee9195bda82d82847b89d05e42

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