Malicious PDF — malware analysis report

Static analysis result for SHA-256 54beb488b9375394…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 10:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b7137cab300d15a384c81b552f5453db SHA-1: 9afeb6446aead59015e4ab83de2cd809b617fcc9 SHA-256: 54beb488b937539469e6613b6118754f406ebb92ef233be3cc7b9a3c497bd309
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://druttle.ru/wix?keyword=life+cycle+of+a+chicken+sequencing+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495999/normal_5fdbd1869137c.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/mifonijoneriturefenu.pdfIn PDF document text
    • https://cdn.sqhk.co/toruwapelot/eiz2q7D/who_is_the_diplomat_s_wife_who_killed.pdfIn PDF document text
    • https://cdn.sqhk.co/tumexifukevu/4jhVgid/gifum.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/egigjij/talatuk.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/59617231472.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/how_much_do_martial_arts_classes_cost_uk.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/vipepojezovobirurogavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_5ffbd16e4e768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_5ff960f1981aa.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/figufuwom.pdfIn PDF document text
    • http://losabaletolo.22web.org/92627714903.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/encyclopedia_britannica_volume_1.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/aab8hih/wood_lathe_machine_definition.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/how_to_change_screen_resolution_on_dell_monitor.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/what_song_is_playing_when_damon_and_elena_dance.pdfIn PDF document text
    • http://xoxejun.iblogger.org/bose_ae2_battery_replacement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_6051762de44c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_603b375cae6c0.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/bumewejozed.pdfIn PDF document text
    • http://zuwazari.22web.org/bare_necessities_piano_sheet_music_musescore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/kiziwala.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_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 5468 bytes
SHA-256: 77ff5f60f856d7ae981bd4e14a664dd2326a42145b7432de4c895a2b399c285a
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 11220 bytes
SHA-256: 7a82ffd394a5cb0d3e2a922c2c2fb2837c8f6579e86364c1e0211569638715c4

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