Malicious PDF — malware analysis report

Static analysis result for SHA-256 e318096bd78e5d6f…

MALICIOUS

PDF

88.9 KB Created: 2021-02-25 20:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b90332797ec00c332c5299e4123a51b SHA-1: ee0c5039a9d8390706fa58a9cda05495baf4c767 SHA-256: e318096bd78e5d6fd7b1e3c7d831430d724415e7e02366b785c0a16ee9f83ee0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring 'pedigree worksheet answers key' and pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to 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://jacksth.ru/wix?keyword=pedigree+worksheet+answers+key PDF link annotation
    • http://kogitijupewe.iblogger.org/kenwood_th-f6a_battery_charger.pdfIn PDF document text
    • http://detonic-ufficiale.website/90048998721um42v.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/present_perfect_subjunctive_spanish_exercises.pdfIn PDF document text
    • http://homebig.space/sniper_shooting_battle_2020_game_downloadrc4uw.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/how_many_employees_does_macys_herald_square_have.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/31553488872.pdfIn PDF document text
    • http://filanion.online/grant_writing_for_dummies_free_downloadnt1w0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gexagulajiv.rf.gd/harley_davidson_fatboy_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/kiroji.pdfIn PDF document text
    • http://rajeripevexe.rf.gd/7855643675.pdfIn PDF document text
    • http://vaxofijuj.epizy.com/phonics_grade_1_worksheets.pdfIn PDF document text
    • http://juwozevukiri.rf.gd/nepakevoguxo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/project_responsibility_matrix_template.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/18676935122.pdfIn PDF document text
    • http://pumumiz.epizy.com/29065859285.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 5100 bytes
SHA-256: c04fd0cfa722b70cda3c88a02711a6cbedcc14fdf187dfcd97c6c130c1ebe873
font_01_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10788 bytes
SHA-256: 921b5d90bcb8fcf51c02ee1d049cbeefb524eb560274ad84a53368f2a0d9f33e
font_02_sfnt_off000147ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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