Malicious PDF — malware analysis report

Static analysis result for SHA-256 3245c257712dc65e…

MALICIOUS

PDF

77.1 KB Created: 2021-04-07 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b617a9a2fde2e644ac0aca0cbef0021d SHA-1: 589d3351300d03852dbe4deba8ea08df85c2d738 SHA-256: 3245c257712dc65e685bbad2c508e78bb8b47096fc081be540bfcc89143819f5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=youth+flag+football+drills+pdf PDF link annotation
    • https://cdn.sqhk.co/bolomekurufe/hhic98X/fawiwaverudusuxorakok.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/gcvIrxB/lannister_sigil_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/RIaoPLc/custom_notification_sound_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/EI47gjL/90_s_pop_hits_album.pdfIn PDF document text
    • http://doguvubewolo.iblogger.org/zikakimeketupemodadow.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/UbBG9kX/56532398131.pdfIn PDF document text
    • https://cdn.sqhk.co/disovaje/ergdHF7/fashion_city_2_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/gjVq1Gw/online_senet_doldurma.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/hhcyvOA/6204155820.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/kds5DnL/92659977973.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/hjeTLgg/nail_salontm_manicure_girl_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_84d564fc53f24ba6a4a313a689c9d8ed.pdf?index=trueIn PDF document text
    • http://losaxoxajav.epizy.com/47803011374.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/husqvarna_automower_430x_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/60717282919.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/software_developer_interview_questions_and_answers_c.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_56420ee8e51f4888a9a606b4a7f84b30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/tema_musical_de_la_pelicula_los_hijos_de_sanchez.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/97057184771.pdfIn PDF document text
    • http://zefawosejek.rf.gd/autonomie_du_droit_fiscal.pdfIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_f3bdd5f329144ffeac31f6225285380a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/texuvosijo.pdfIn PDF document text
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_b2526b0a9676480abc0ebfc7ffdc3821.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/mechanical_engineering_technology_programs_in_us.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/kuxefafomevesorefubefix.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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5404 bytes
SHA-256: bad454921454b67ada179ffbd325aa04ab7a73d17e841263667e8ff80f1b3f7a
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 10652 bytes
SHA-256: 0842f0720ab2bbec8e1d8e7fb68acbdb698286e5d698194bd825a80ed4658e15