Malicious PDF — malware analysis report

Static analysis result for SHA-256 b388ddfec1f0fa15…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 15:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46b4174afd9dfbb3c41c8ec79540e4bb SHA-1: 046c422b840341c2521fe6db30be4366df147f4e SHA-256: b388ddfec1f0fa1546d8fb649e2590d143230cc81825362acbecf9144dad740c
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 hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://seumenha.ru/award?keyword=chapter+two+play+pdf
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/ed9400.pdf
    • http://zupurowuzuxule.iblogger.org/bekuxek.pdf
    • http://kitafoged.medianewsonline.com/3rd_grade_worksheet_reading_comprehension.pdf
    • https://cdn.sqhk.co/bujasugawo/0whe66M/2501698181.pdf
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/jajonasit.pdf
    • http://ralugugifoxatir.scienceontheweb.net/application_of_remote_sensing_and_gis_in_disaster_management.pdf
    • https://cdn.sqhk.co/xasakeza/NNigibQ/cartoon_network_games_online.pdf
    • http://tesekal.mygamesonline.org/89405335268.pdf
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/sigewota_kuwiwenoseme_rulod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6b6e39b-67e7-4aef-a717-ae577eaf6dd4/fotavigojarezorudujepa.pdf
    • http://kimajuj.epizy.com/yellowhead_highway_report.pdf
    • http://nabenejajoko.myartsonline.com/the_brothers_grimm_spectaculathon.pdf
    • https://uploads.strikinglycdn.com/files/0fa916d5-88b7-4eb8-b44e-b3fd8917a795/mobosuvawi.pdf
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_a6303f7a4c9b43489a797151bf6b2112.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b00f80f2-310e-4719-be78-75aa7ca63bc3/58470766874.pdf
    • http://rafetomobu.rf.gd/proper_assisted_pull_up_form.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_35536981123e4ceb8eca985a557f393a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b322764d-3a89-4218-b2be-78859d6bc795/38954076840.pdf
    • http://sotidunuzijifu.epizy.com/vakirutunugubarovavezilew.pdf
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_14ff6010ef9e4953b33fa67cb03ce4de.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ad.bin
d6b50d323e91c7ece4a41651cffb989d947f682d73ab091aa99695cd1374e216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 5052 bytes
font_01_sfnt_off000105e8.bin
c7766945eea5d5494dd422258dce202246b08164bf26da248904d684fe1834a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 10840 bytes

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