Malicious PDF — malware analysis report

Static analysis result for SHA-256 865817f57a4d0812…

MALICIOUS

PDF

69.9 KB Created: 2021-03-11 22:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7b91bb450d5933fb52629c4604020712 SHA-1: 7cda001d9add4b1fd8e13c060d83ccf667d7d5d1 SHA-256: 865817f57a4d0812863cde9afec697fc341799eddb4cd001594e6f1e8cc59335
146 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be related to installation instructions, suggesting a lure to trick users into clicking malicious links. The presence of embedded URLs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xajibur.ru/strik?utm_term=zmodo+zp-nl18+installation PDF link annotation
    • http://shopbest.online/holt_physics_textbook_online_freejmkol.pdfIn PDF document text
    • http://amandeepsadyora.com/wisconsin_state_constitutionbe99a.pdfIn PDF document text
    • http://islemleriniz.org/tuwoferipofurigepuwujunk83y.pdfIn PDF document text
    • http://kismyketio.com/23528243401k90f8.pdfIn PDF document text
    • http://fullstacket.online/scarcity_and_factors_of_production_worksheet_answers022vm.pdfIn PDF document text
    • http://ludshop.xyz/naranja_mecanica_pelicula_completa_youtubealomy.pdfIn PDF document text
    • http://lovelyhouse.online/what_is_the_best_lay_z_spaieugn.pdfIn PDF document text
    • http://beveram.66ghz.com/advance_wars_3ds.pdfIn PDF document text
    • http://lasofetuxig.22web.org/bupugene.pdfIn PDF document text
    • http://piredvizhnik.com/789018160776oqje.pdfIn PDF document text
    • http://labiosdewonda.com/drawing_app_for_mac_free_downloadmghfx.pdfIn PDF document text
    • http://4338bacchus.com/7710888806jom6f.pdfIn PDF document text
    • http://genusadnlo.space/go_math_kindergarten_practice_book424wr.pdfIn PDF document text
    • http://beststudent.fun/28259306626pic24.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/pevuwarobuvowa/34939755514.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/skype_for_desktop_windows_7_free.pdfIn PDF document text
    • http://wukekikisowif.epizy.com/89334368177.pdfIn PDF document text
    • http://boxugajot.rf.gd/vubikukivepaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/59481845729.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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 5296 bytes
SHA-256: 1e7464c793c8de7efab33f55622864808efe7f2679ec81d24bd41ae5d63eb946
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10588 bytes
SHA-256: 78d3e0a56e4846007fde1a76eee28f76642a948c664fa0e60c4ccc3fb62a39ec

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