Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fb170e7e6c9a18…

MALICIOUS

PDF

99.3 KB Created: 2021-05-21 06:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b1f762cedb4317b3636b2f35ecb1afab SHA-1: 0f1388858c577f311af4014ddd92ed8187470c66 SHA-256: d5fb170e7e6c9a18c117e22e03d02d83ff6d2f0c0a88a2674e9eb7a4f31c21c4
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 of which point to benign-looking PDFs but are likely part of a link farm. One of the primary external links, https://nipisod.ru/strik?utm_term=jaroslav+seifert+maminka+pdf+kniha, is flagged as unknown reputation and is likely the malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

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 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://nipisod.ru/strik?utm_term=jaroslav+seifert+maminka+pdf+kniha PDF link annotation
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/4029095.pdfIn PDF document text
    • https://kujufilobi.weebly.com/uploads/1/3/1/4/131482850/geligu.pdfIn PDF document text
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/keridix.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/2259941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_603af49154eea.pdfIn PDF document text
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/juzirijuzij_kopawesudu_jexonelivi_garofudubiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_6013f499a2fc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f18107f4-635f-4b96-86a8-30630b7be41c/imgenes_de_caras_de_emociones_y_sentimientos_con_nombres.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/algebra_equations_worksheet_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54374bc-1649-4fce-9fa2-6ba553b143cd/56601249058.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/ksp_jailer_warder_key_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/64151184691.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/nijepe.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/tomivu.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/boludatem.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/android_messages_on_pc_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56922506-844c-428e-81d2-9ceb67195722/meaning_double_down_slang.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/crystal_reports_viewer_2008_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/zifexizuweko.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/95096053575.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/34798631402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7b07d0-a6e3-45f0-8583-323a4c136091/wobelibezawukoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a60345-1009-47d6-91c1-9bcb30c98f86/what_is_a_good_powder_for_reloading_223_55gr_bullets.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/bitbucket_branch_source_plugin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 5180 bytes
SHA-256: 064ea2a6f40de3cd85f8cbfd27fe92a7aea97bced8b80f7c83b927184856eb19
font_01_sfnt_off000146d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D4 13588 bytes
SHA-256: b272777003ee9b49435bcec9ce89974bb8ecc531551ecd69fd994af91f3f6566
font_02_sfnt_off00016fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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