Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0f4799bb163c2c…

MALICIOUS

PDF

78.3 KB Created: 2021-04-20 11:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9337879539523c492043c3037b719f54 SHA-1: 277ebe8ab3760bd1c0671baec8a14b11b89492e7 SHA-256: 8e0f4799bb163c2c533bd889892fea36ec996f8271b9d4a63fe162c6efbbf53d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated educational topics, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=problemas+porcentajes+6+primaria+resueltos PDF link annotation
    • http://vasakuso.sportsontheweb.net/japedezubugogobasewudaxab.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/8209310.pdfIn PDF document text
    • http://rometolipopi.iblogger.org/what_is_an_aa_meditation_meeting.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/346304.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/zasegulu.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/90247382422.pdfIn PDF document text
    • https://fubuvomaxafufil.weebly.com/uploads/1/3/1/6/131637814/gozupavoxoz.pdfIn PDF document text
    • http://kofugefosuziwib.22web.org/klasifikasi_tanaman_anting_anting.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/fagirajugefubof_kukezogitoreti_meriro_dilojatafat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexivakerofus.rf.gd/balancing_chemical_equation_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/lanakevepikag.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/how_to_get_alpha_symbol_on_mac_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/do_you_need_a_highschool_diploma_to_be_a_real_estate_agent_in_texas.pdfIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_d067f5aa11c8495daeb561e37354ed57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/kiffe_kiffe_demain_chapter_1.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_049162f23e5a4e1a9c0c4d2058efc922.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_986cf00208a340d6932a7e84140c8968.pdf?index=trueIn PDF document text
    • http://wafijolosa.epizy.com/69557982562.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/el_nuevo_houdini_past_tense.pdfIn PDF document text
    • http://putotapuzavip.rf.gd/tiwabupi.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/79686338983.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/gelisudi.pdfIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_0017637a3f3948dc9d4416ba429c5fc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/bhajan_odia_new_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/kovivajejad.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_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 5452 bytes
SHA-256: 0c4f3ed40ed00930a0795b0ad3d0b0ead8acb1689c28a39232e1d3b77a0d53d9
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 12200 bytes
SHA-256: e925aafd5ba99f06cb466602dd0c3846c8776b4386b99ed465822e7b5b326efc

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