Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c34982c4aa9eba…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 19:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 620d4909c2e2f27599c3c11e1065d6b0 SHA-1: 428b2030bf4221081800ee33f71645351dc7fb85 SHA-256: 86c34982c4aa9eba6a81d459c5baa6e95583fce39b55a9baa01a63a9b8ef4b23
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that redirects to a malicious domain, likely to download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=possessive+nouns+worksheets+for+grade+2+with+answers PDF link annotation
    • http://static-get.top/texas_am_galveston_meal_plans1jkki.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/89941308774.pdfIn PDF document text
    • http://timurberg.ru/fluke_dtx_1800_price_in_indiaixd9k.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/81084166519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_5fdae2f22c540.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/87267402393.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/tcp_ip_network_layer_explained.pdfIn PDF document text
    • http://trujillostacoshop.com/how_to_tie_a_knot_for_a_pull_cordu39zo.pdfIn PDF document text
    • http://introdom.ru/fifth_edition_character_sheet_mod_apk76o4t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_5ffb3f42ced80.pdfIn PDF document text
    • http://opensalle.xyz/koxobarulamegufonagob5ck9b.pdfIn PDF document text
    • http://harmony-market.ru/basic_macrame_knotsvplk0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_60293b46127ef.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/big_fish_casino_free_chips_and_freebies_digitalmart.onlineoncel.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://s3.amazonaws.com/zoxewudunigus/passport_renewal_form_uk_child.pdfIn PDF document text
    • http://novupomajanox.atwebpages.com/studies_about_english_language_proficiency_in_the_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/final_fantasy_xiv_culinarian_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/97588770063.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/biblical_names_and_their_meanings.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/piwarorepe.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/pc_gamer_build_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/gajijilobolotewade.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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 5368 bytes
SHA-256: b1e249ab97dba467c55102a1a91dcb70d5edf9c241fa955f14f4c92184038fc3
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10800 bytes
SHA-256: a19b4d063f3f75a7cf7457d62a6daab7f927b0c374a18353305ec4fc3d11c920
font_02_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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