Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638e442a69c1ea8…

MALICIOUS

PDF

87.5 KB Created: 2021-02-22 21:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 57ca699eb4c5431dfc7043566da5e894 SHA-1: 8997549329b9c8e095ec540aeddab702f5d6adcd SHA-256: 2638e442a69c1ea897c00c219c96fadce23dc04625bdd9fc2cc6d12cd0e52ffd
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not typical for legitimate documents.

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
  • 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.
  • 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/strik?utm_term=how+to+check+continuity+with+craftsman+multimeter In PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/1170156.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/aFlieCX/tapizuguw.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/zajojuf_jitutiboj.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/LfgjbWO/40919861966.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/emFhf3O/jamebawovomofiwosupe.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/geyI1M1/2nd_grade_common_core_math_word_problems.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/benadexu_rinitisopu_darojukojojasu_vegaruranoxul.pdfIn PDF document text
    • http://toxaxugepevu.iblogger.org/30193539304.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/7396ab307ed2.pdfIn PDF document text
    • https://cdn.sqhk.co/visevunu/egihbia/zinebutevavadidejijup.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/dagasopones/reported_speech_backshift_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/puxamatewuleros.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/extent_reports_with_specflow_c.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/english_words_in_sentences.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/student_anecdotal_records_template.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/barcelona_team_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/maths_worksheets_for_kindergarten_printable.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_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 5340 bytes
SHA-256: 1b07a1cb3ef1203b85e5bcf9914209ed8bda1ca478c224907f0ea14eaf128a77
font_01_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 11000 bytes
SHA-256: a8c794a2a00e342c8645152199640c99581966a72ec038e5208c75e982739270

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