Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce733ed8f2e77fd…

MALICIOUS

PDF

77.8 KB Created: 2021-04-22 23:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31dd402621ec1bd04625e67f48b4ae0 SHA-1: bb175783230e73c7f141679d539f36b70f77e5fc SHA-256: bce733ed8f2e77fdde68e866ff2e9f3e90007942451ee99c86d608f5a5aee471
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 unrelated PDF files, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+use+optavia+blender+bottle
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/3392788.pdf
    • https://wilubowedawiwo.weebly.com/uploads/1/3/4/5/134528918/3467562.pdf
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/gabolemopuzolubime.pdf
    • http://itchia.space/depipugolezudikafubero09xt9.pdf
    • http://xoziduso.mypressonline.com/mibak.pdf
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/5215a4eba8a899.pdf
    • http://xulilutunezenu.22web.org/19328846779.pdf
    • http://nojagemegoxeda.22web.org/take_screenshot_mobile_android.pdf
    • http://keluzizizeroki.getenjoyment.net/scaredy_squirrel_makes_a_friend.pdf
    • http://kengoru.space/jalamiralezjjnv.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/pubozawela-tezusosidag-kelerow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mowadavukusut.epizy.com/facebook_video_er_chrome_android.pdf
    • https://uploads.strikinglycdn.com/files/89eb2255-b3b9-4e4e-8091-0f0441a30dde/tc_electronic_hall_of_fame_mini_shimmer.pdf
    • https://uploads.strikinglycdn.com/files/e28fa293-91f4-4991-949f-5809c185a9c2/dr_seuss_books_online_text.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_798dfad5f861422da8ce3904126e616c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/51005cd8-79c8-4004-98f7-53f2656cef8e/1448285921.pdf
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_aafd09eb08304e769add4b907ebd5988.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_f759d045cf4e47b8a72c109d351ffbbd.pdf?index=true
    • http://pitefabe.epizy.com/descargar_chromecast_android.pdf
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_d4f928380778446197d65ec721177053.pdf?index=true
    • http://mejovusemuvov.rf.gd/how_much_does_an_english_course_cost.pdf
    • https://uploads.strikinglycdn.com/files/6330a6bb-a2a1-44af-8838-e6426d4e3cd3/harry_potter_and_the_half_blood_prince_filma_24.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin
ebed416ecc78be0432483a38b9d3d0b4ddd8039106abdb98197df8ff662a4d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5204 bytes
font_01_sfnt_off00010423.bin
919e47e3f51b18fc8a5861901f20f6d0fd768af4a19f9812c1d4887932640f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 11124 bytes

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