Malicious PDF — malware analysis report

Static analysis result for SHA-256 1104bd3f4d35ec15…

MALICIOUS

PDF

87.7 KB Created: 2021-03-16 04:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9675473ca5c4732f3951d3eae433fc6a SHA-1: 963d5880be7cbc2e5a5d88940bd5ba2c08580451 SHA-256: 1104bd3f4d35ec157131b545587ab8f640fbb248c2378320fce918fbaec1042d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to calculating pool volume, which is likely a lure to direct the user to the embedded URL. This URL is suspicious and likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=how+to+calculate+pool+volume+in+gallons PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fc92eb663178.pdfIn PDF document text
    • http://e-devletodeme.net/areas_del_departamento_de_alimentos_y_bebidas_de_un_hoteloeekr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_600d0ce7e4ec6.pdfIn PDF document text
    • http://voicebftyi.com/rizajilanoxulewotuletovabw56v8.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/doTsmOe/15273089709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_600cad23f3a0b.pdfIn PDF document text
    • https://cdn.sqhk.co/pukikojat/hgic4s9/asteroid_hitting_earth_news_today.pdfIn PDF document text
    • https://cdn.sqhk.co/lufasawo/gficbjc/mopikogidiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_600f64b35a136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5ff8d65c17ba8.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/ixhfq25/fantasy_jigsaw_puzzles_online.pdfIn PDF document text
    • http://salonhq.xyz/does_webull_track_day_tradesb6w4p.pdfIn PDF document text
    • http://poradoit2.site/remelodufgkwb9.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/iiMzheY/30560704404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_05232fee20c1423bab5a91566c48aba2.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_ab9da57155384b0f863442c2a33bf5a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/feforafijekufiguge.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/new_kprc_sports_reporter.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_d3285285ae134f47a38b57c3ed20ef9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/how_much_should_i_charge_to_design_an_album_cover.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_e36c9e7e090349ac86f2d23093446a7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/xukoguramexexobakatekuti.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_4f191149184443f988cf64a110820284.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/kritika_class_10_chapter_2_answers.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_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 5268 bytes
SHA-256: 4b1a85721979468cdab286862f79fba7d79b48e1352d595e3111261345363a7c
font_01_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 11364 bytes
SHA-256: cfaf75bfdb37f457f70e322c031de83a9a0a851dc0077284c186dcb8988952ca

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