Malicious PDF — malware analysis report

Static analysis result for SHA-256 0853ed438a307639…

MALICIOUS

PDF

93.6 KB Created: 2021-02-05 17:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f109ce953490f2a4f9818c467c1568f1 SHA-1: b2de0c9d74b042ad2bbf3ac49f91ee2cc87f4786 SHA-256: 0853ed438a307639dce5b421e043c5040a908b554c36393967b44532d4e675c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though partially corrupted, indicates a lure related to 'symmetry worksheet for kindergarten', which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wb?keyword=symmetry%20worksheet%20for%20kindergarten PDF link annotation
    • http://idealica-italiaufficiale.site/bioquimica_libros_gratisde8m0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378641/normal_600917b624d16.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/jilemi-xoxokovefo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fe1cf6964a45.pdfIn PDF document text
    • http://busurman.space/247277015890ix58.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/nifutodonifu_jubade.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/1297713.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/gckjaie/punch_boxing_warrior_ninja_kung_fu_fighting_game.pdfIn PDF document text
    • http://dvestideyli.xyz/exercice_sur_le_calendrier_ce2nayo3.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/wapix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ff4fc3c2b1f4.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/Jjcjg8E/classical_music_radio_stations_list_nyc.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/300849.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/IhejdbT/halloween_party_invitations_diy.pdfIn PDF document text
    • http://mabay.fun/boxedaralix3ho6d.pdfIn PDF document text
    • http://steblin.pro/5741656440389zwp.pdfIn PDF document text
    • http://rerubin.space/rikazeluropatuwekuxokrkq4.pdfIn PDF document text
    • http://indonesia2health.online/watch_friends_season_8_episode_6_onlineamsy2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 6832 bytes
SHA-256: d3108faf9f6a8a7872c74692c507300d53e7a290d8a227f042fb1b17f58fbaf4
font_01_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 5648 bytes
SHA-256: 21176b2ea51ddeeec5e9cd994416140dcebeac65fc3c311d192b61b5c345148e
font_02_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 11232 bytes
SHA-256: 847e11b7cd5ffb1acf5b7b7018b6404831cfb193f434564a58f3359e9bb50d8a
font_03_sfnt_off0001536b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536B 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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