Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aeac8d4b4666110…

MALICIOUS

PDF

82.4 KB Created: 2021-02-07 18:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f5540f595abb9ebb0185f7dcbe62b99 SHA-1: 521ee9f82ab17476f406caa254bf0cecd2d1b0c1 SHA-256: 0aeac8d4b46661102d0dfe663d799faad7650aeeb64b445f99fab447fd8b18cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, flagged by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to drive traffic to potentially malicious or spammy websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the sheer volume of external links points towards a content-driven attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=baking%20cakes%20in%20kigali%20pdf PDF link annotation
    • http://wujumelugesebem.22web.org/alan_walker_lily_mp4.pdfIn PDF document text
    • http://ijmalan.xyz/toyota_camry_2013_performancekuw9x.pdfIn PDF document text
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/223904.pdfIn PDF document text
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/kewebozosasasero.pdfIn PDF document text
    • http://dorightunion.com/at_t_pay_my_cell_phone_bill_onlinefjogt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resisuna/bengali_movie_website_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/ntr_songs_naa_songs_old.pdfIn PDF document text
    • http://zomijoler.epizy.com/play_store_app_android_5._1.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/bloody_khooni_monday_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/application_passport_canada_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/accuracy_and_precision_pre_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/mozonalowol.pdfIn PDF document text
    • http://gelanuvefod.epizy.com/new_odia_film_dj_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/21562997947.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/retogadesolozuzoxebosap.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/kotor_2_sith_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/bituminous_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/akreditasi_ban_pt_uin_malang.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_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 5340 bytes
SHA-256: 3dc512c190b80d5241c19b7b3f1541fdd53881bfc9ba7d715c98b116ae2837cc
font_01_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 10488 bytes
SHA-256: 3a24b0607da29c6a869b3d58b9e3644eb5c0e759487efb441f5a801c6adc9a83

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