Malicious PDF — malware analysis report

Static analysis result for SHA-256 f575240896c79e3f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 19:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0d6cfcff2b6e296020111eb2d8dfbf77 SHA-1: 43fb2ae2d81d02e7d54c45d6f9ef7e3ebbe50ee4 SHA-256: f575240896c79e3f61e081ad7a26284538623729998df602a3f97400d8d5a23c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be related to search engine optimization for free PDF downloads, reinforcing the phishing lure.

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://kuzutuzo.ru/award?keyword=sanitary+engineering+book+pdf+free+download PDF link annotation
    • http://mamajan.space/one_summers_day_piano_midinyc7c.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/wilebamukagaloruzu.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/suwil.pdfIn PDF document text
    • http://idealica-columbia.site/41199808241unukr.pdfIn PDF document text
    • http://opendouche.xyz/2898024824yugiy.pdfIn PDF document text
    • http://imedo.ru/katemalawikuvijedexogugkp6og.pdfIn PDF document text
    • http://shopbest.online/five_examples_of_similet42m5.pdfIn PDF document text
    • http://lozhobelir.space/vilazajawidigadididawasep39331.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/5288707.pdfIn PDF document text
    • http://cparta.moscow/8980093795447z1p.pdfIn PDF document text
    • http://vitalia-transports.com/the_100_season_4_highlights45uo5.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/furiliguriwob.pdfIn PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/fukukuw.pdfIn PDF document text
    • http://milktree.store/what_is_the_best_survival_kit4ua83.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/764142b872a.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/skin_alucard_obsidian_bladev8098.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/kijelopazekune/citizen_cohn_book_review.pdfIn PDF document text
    • http://megugasawixige.onlinewebshop.net/51722544008.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/advertisement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/30335767030.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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 5532 bytes
SHA-256: 0ca24aa35569b06bcb720beb91f376eaf8578b5b0c35ae2d885a998bee6f1a9a
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 10440 bytes
SHA-256: 59c23b16fb3e4bc9993c22e7269ed21d439c9647a186799f7f00db88fa5d5db6

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