Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf9ba662e77d438…

MALICIOUS

PDF

79.5 KB Created: 2021-04-24 07:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9215c88d7c80e8f7bd41e8d0db3ce67 SHA-1: d7d92361c130b24bdca531651026941b31eab8a5 SHA-256: 3cf9ba662e77d438ba11f190777dc887b80609c48f99a533257fe2d2ccbabcc6
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of external URIs indicates a potential for further stage execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=how+to+play+2+player+on+goat+simulator+ps4
    • http://tagaporigowekis.mygamesonline.org/auditor_general_of_the_federation.pdf
    • http://ibkreactiva2020.com/how_to_conduct_disciplinary_investigationszh2k.pdf
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ffeb2a393d10.pdf
    • http://fuckfrsky.com/acrylic_nails_with_rhinestones_designskeprz.pdf
    • https://cdn-cms.f-static.net/uploads/4450719/normal_602f3717e675c.pdf
    • https://cdn-cms.f-static.net/uploads/4407733/normal_6016c1a1dc2d9.pdf
    • https://static.s123-cdn-static.com/uploads/4426557/normal_5fef5610aa9af.pdf
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff176d5b2887.pdf
    • https://cdn-cms.f-static.net/uploads/4413227/normal_5fd0e1d4882d7.pdf
    • https://cdn-cms.f-static.net/uploads/4471995/normal_603f3fe0dff10.pdf
    • http://mekapidi.medianewsonline.com/pre_calculus_grade_12.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_602125c6d16ab.pdf
    • http://cabinetshub.xyz/are_green_smoothies_good_for_weight_losscoyna.pdf
    • https://cdn-cms.f-static.net/uploads/4490371/normal_601710f189fa5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/07dfb6a2-40b6-49c4-87db-6d5930b3abb6/76322078041.pdf
    • https://uploads.strikinglycdn.com/files/01914566-1eaf-4414-8fd6-06e0c53cae78/tubidy_mp3_descargar_msica_gratis_2017.pdf
    • https://uploads.strikinglycdn.com/files/1541fbcb-e2bb-4640-9e9d-d667a407d2d0/how_to_clean_hamilton_beach_air_fryer.pdf
    • https://uploads.strikinglycdn.com/files/21e98f29-0893-4d72-8496-6d586aaa3a66/abiyoyo_book_discussion_card_12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f7.bin
db322802771672aeabf6ca69f041f2099e032422765a1535a52e205928560f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 5396 bytes
font_01_sfnt_off0000fc56.bin
3606a95bcd6d1c19adc9cdc216b97969c0640f24e0481c7401a148204e7864ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 11308 bytes
font_02_sfnt_off0001229f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 4324 bytes

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