Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f58a0e05a43cb33…

MALICIOUS

PDF

69.7 KB Created: 2021-02-23 00:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 067cf3596cff213d94338331c1c7d48b SHA-1: 407d4ad08dd95b60e5fef0ea650761cb9e21bb3a SHA-256: 4f58a0e05a43cb33e989e0ff7fc7a0a3880d8dc7a363d27eabc710a4aef2ef09
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to children's learning materials, which is a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic indicate a strong intent to redirect the user to potentially harmful content.

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=numero+en+ingles+para+ni%25C3%25B1os PDF link annotation
    • http://pemeturaw.iblogger.org/93309376986.pdfIn PDF document text
    • http://faceit.su/plum_berry_cornmeal_sheet_cake1fvjo.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/cjdQid7/brinks_master_code_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/0ggjj57/77852957029.pdfIn PDF document text
    • http://ijmalan.xyz/gituguf4ee11.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/pz5jami/baxogibojawusaroxani.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/VrHOhf5/wefapo.pdfIn PDF document text
    • http://nashremont.site/how_to_write_a_student_president_speecht948t.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/dragon_ball_heroes_arcade_machine_buys6sk8.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/iggju0D/wisugabobosesodogen.pdfIn PDF document text
    • http://mmmmmme.space/76589004227wmfxs.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/g0MNge0/22437620333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokabopexo.epizy.com/what_oven_temp_for_pre_cooked_ham.pdfIn PDF document text
    • http://gepaboveron.epizy.com/sairat_yad_lagla_song.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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 5320 bytes
SHA-256: 214e57898ff6f1d72f5ca496a87442329e9f3b50cd53ea22f5ca8bde9b36baf6
font_01_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 11848 bytes
SHA-256: 9b09b4b11d6e47207ef7b261572b83a2ee7e8e52a35ff732f856db8e7d5bdc47

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