Malicious PDF — malware analysis report

Static analysis result for SHA-256 972dea2cdb902c87…

MALICIOUS

PDF

70.0 KB Created: 2021-06-06 00:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c011f2871b794262d5bab67088e1aed7 SHA-1: 9dd6f94456ee8bb8978575e1f25a292094e9b711 SHA-256: 972dea2cdb902c872442f0af6b04cccad5d44e10bf80bda886b8e4cd34061f8b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily corrupted, appears to reference educational material, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=libro+de+matem%25C3%25A1ticas+tercer+grado+primaria+paco+el+chato
    • https://cdn-cms.f-static.net/uploads/4471250/normal_606cd0fba693a.pdf
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/a6d6990e1.pdf
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/pokubunivur_ratexinen.pdf
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/bifexoxuked.pdf
    • https://cdn-cms.f-static.net/uploads/4499653/normal_5fd80b9786666.pdf
    • https://cdn-cms.f-static.net/uploads/4375076/normal_606c205acb244.pdf
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/69cfd3d913450a.pdf
    • https://ziwugedaxuz.weebly.com/uploads/1/3/4/5/134501511/08fbb2b5b5d.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_601653c1efc71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://laxaxufudej.pbworks.com/w/file/fetch/144491499/73382294005.pdf
    • https://uploads.strikinglycdn.com/files/7c018b2e-6353-4647-9bdd-9adaac7300df/the_stand_cbs_review_reddit.pdf
    • http://gexufak.pbworks.com/w/file/fetch/144606252/fejaxupasu.pdf
    • https://uploads.strikinglycdn.com/files/c44cc75c-dd35-4b9a-b512-59892d41bd51/78373537960.pdf
    • https://uploads.strikinglycdn.com/files/0c4f3cda-9507-4a75-a5b0-3acf7e593a66/what_happened_between_1750_and_1850.pdf
    • https://uploads.strikinglycdn.com/files/5480e90e-6e54-499d-8752-09c69096c27e/how_to_apply_vidyalakshmi_education_loan.pdf
    • http://pifiloxema.pbworks.com/f/guzalifunavovugovuzizez.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144618438/mitasopakunu.pdf
    • http://sujagajo.pbworks.com/f/11.snf_kimyasal_tepkimelerde_enerji_zml_sorular.pdf
    • http://bopelijexuf.pbworks.com/f/majukeliwuwiledanobas.pdf
    • https://uploads.strikinglycdn.com/files/c5ed6ec7-a024-4d15-8f3d-620727c03482/apple_iphone_5c_release_date.pdf
    • https://uploads.strikinglycdn.com/files/53eacb35-9f92-4429-a180-4f929b9d37eb/rerewosa.pdf
    • https://uploads.strikinglycdn.com/files/a2b69f8c-347b-4597-882d-b764f5a8ce55/motexogoxapufenadorotalo.pdf
    • http://tekitejug.pbworks.com/w/file/fetch/144670338/rufowadifa.pdf
    • https://uploads.strikinglycdn.com/files/2a4c06c0-fb34-4ef4-a2f2-40897e37bcf2/81746718151.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_off0000cfd6.bin
6ab33c7d55d6631f2688de0d8865c8c872ffa2d93c8e8a4064c22fb1b17f6864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 5804 bytes
font_01_sfnt_off0000e2cc.bin
a418d6227417cb936b8abbbef168e08a646414a7498c1a5d1fb6a5818339b979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 11480 bytes

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