Malicious PDF — malware analysis report

Static analysis result for SHA-256 7525195666db83f8…

MALICIOUS

PDF

67.9 KB Created: 2021-02-25 02:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 46571baf5275fde013b802cc477abcc5 SHA-1: c84660ad31f6bcc024004627d30fab9d0f5d0ea5 SHA-256: 7525195666db83f89603dbc6270d2717d9af54d2b5f0617c56ffe5a8f91c33ec
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm or phishing lure. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

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
  • 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://maypoin.ru/wix?keyword=which+one+doesn%2527t+belong+worksheets+for+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470977/normal_601e74864f4fa.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/vufodezikike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_5fdbde3b306b1.pdfIn PDF document text
    • http://select-get.top/14827043389thu9r.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/pemejebezuje_tomojuwagu_dexutuzej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_6027de7bac05c.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/brothers_telugu_movie_free.pdfIn PDF document text
    • https://tupumerar.weebly.com/uploads/1/3/2/6/132695397/8641489.pdfIn PDF document text
    • http://pimolala.22web.org/heart_wallpaper_images_hd.pdfIn PDF document text
    • http://nickned.me/jaxoz37x1q.pdfIn PDF document text
    • https://gizipiwiro.weebly.com/uploads/1/3/1/4/131454158/linegaxu-duxufojis-saxite.pdfIn PDF document text
    • http://sepibigejakina.22web.org/gedanelujit.pdfIn PDF document text
    • http://fakts.design/harry_potter_und_der_stein_der_weisen_hrbuch_kostenlos_anhrensyboy.pdfIn PDF document text
    • http://virona.org/taylor_pool_and_spa_water_chemistryolc7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekujigifur.epizy.com/baltimore_ravens_injury_report_week_2.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_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 5624 bytes
SHA-256: 0b4a2cec95d0e513ac450c715ec896d7ac97e19bac3ab46bafc4acb89bf9af8f
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10496 bytes
SHA-256: 3641063b3f1aa01f576d9fb813c96e19b54fc5d45613985f5ae534a7553b67ef

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