Malicious PDF — malware analysis report

Static analysis result for SHA-256 7625453fde51caa2…

MALICIOUS

PDF

87.2 KB Created: 2021-04-26 13:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9622f25fd5b596c961b3a19ec7310bb SHA-1: 349f23e8af8acd1490486f35b7fff6f9dadfc3d5 SHA-256: 7625453fde51caa2a0c29dc4daf57fdf7142eb4ea12e5845893a3a4bad799b66
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, https://kuzutuzo.ru/strik?utm_term=marshall+rosenberg+nonviolent+communication+summary, is likely used to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kuzutuzo.ru/strik?utm_term=marshall+rosenberg+nonviolent+communication+summary
    • https://cdn-cms.f-static.net/uploads/4369769/normal_605f74fc2c4a1.pdf
    • http://mukinumatonewo.getenjoyment.net/aprender_a_leer.pdf
    • http://borejukeluteva.mygamesonline.org/reguv.pdf
    • https://cdn.sqhk.co/nutewakizi/BidVXib/weekends_only_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4500878/normal_603f4f7b7b8e4.pdf
    • http://towonededuv.medianewsonline.com/2020_ashrae_handbook_hvac_applications.pdf
    • https://cdn.sqhk.co/towevefizub/jhzJhio/funimarejevokiz.pdf
    • https://cdn.sqhk.co/topefebi/dhS5icg/71280135829.pdf
    • https://cdn.sqhk.co/guzoladip/grm9nja/oklahoma_natural_gas_number.pdf
    • http://xeberul.mywebcommunity.org/widuzovodapajafopofuliw.pdf
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2618c3c0-8d90-4c11-b2d4-ecc0af6efb81/how_to_do_technical_writing.pdf
    • https://uploads.strikinglycdn.com/files/af3a2a6d-6ccd-4409-be55-d455a818fb8d/where_is_free_willy_2_filmed.pdf
    • https://uploads.strikinglycdn.com/files/e7e3beca-70e5-4fa2-9b4f-b724dffe497b/que_es_el_derecho_civil_en_colombia.pdf
    • https://uploads.strikinglycdn.com/files/09c073c5-9c26-415a-8330-29385f05db99/the_mysterious_stranger_satan.pdf
    • https://uploads.strikinglycdn.com/files/ecd8f67d-fb9c-4479-a1d4-44840d107e2b/chicken_soup_for_the_soul_cat_food_canada.pdf
    • https://uploads.strikinglycdn.com/files/23739833-3f2d-477e-8981-cc10c9d35a1a/jojofelovoninagoju.pdf
    • https://uploads.strikinglycdn.com/files/b4aa0a08-d1b7-473b-88c8-8a6e7b3482a4/dejame_que_te_cuente_limea_maria_dolores_pradera.pdf
    • https://uploads.strikinglycdn.com/files/88f94490-30ed-47a4-9162-15f945f1eb33/snapper_riding_mower_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/36044d1f-9613-4c68-b542-0ac7e6d5d19b/woman_warrior_white_tigers.pdf
    • https://uploads.strikinglycdn.com/files/4ef24e94-dde2-497d-9ea8-57c2c3b82304/35469691502.pdf
    • https://uploads.strikinglycdn.com/files/41d62b76-68b5-4080-bdc3-94cc2db93032/how_many_reps_to_do_when_lifting_weights.pdf
    • https://uploads.strikinglycdn.com/files/3878816d-6fa4-45ad-9b83-070f2584aff2/panasonic_mobile_service_center_salem.pdf
    • https://uploads.strikinglycdn.com/files/c9d905d6-c1b7-4752-b64e-6a58abce48ec/97077283552.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_off000107b6.bin
1b495f0b17675f95e6f6e6dccc45b822283c6892791cdfd50a85644cc3a31bc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 5404 bytes
font_01_sfnt_off000119fc.bin
e15949a86438c81d09571f1c2ca8830512ab333558c85d2483549f0b1021f09f
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 10856 bytes
font_02_sfnt_off00013e93.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 4324 bytes