Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aad1916b441427…

MALICIOUS

PDF

73.6 KB Created: 2021-05-27 12:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e1025b7ea5d1782758559ae171719cba SHA-1: 62524443a1eecd01dd0dd65a5ba40c82b3edc1f8 SHA-256: d4aad1916b44142729b3db7ab00378b8e0cba28b40b27e1dca9b50a9d7e2e20a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme, likely using JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=ver+series+y+novelas+colombianas+online+gratis PDF link annotation
    • https://pozesipo.weebly.com/uploads/1/3/5/3/135346015/lazadime-bidugifabasab-fejowajubemi.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/bigoroju.pdfIn PDF document text
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/9280169.pdfIn PDF document text
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/puwadobis.pdfIn PDF document text
    • https://famuzupowaja.weebly.com/uploads/1/3/1/4/131406758/kigexe_vunope_gegawizegi_wivoxivok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b5fe95-23c9-4868-abf5-d3cda7731957/lugevovesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347eac15-bac1-439a-9d9b-f1b79738f62a/33308434006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a038b88d-3a66-43b1-ab4d-81ee745eb2c9/wapigugarolupukokepidan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09401a9b-2e1d-4da0-8b22-d02397e72bc6/85916266093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31347919-2e52-4132-b128-03c7187fa7a1/womafowugawag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb03da0-992b-45f2-a818-5086142ef147/coast_guard_medical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c4e493-d247-4430-acef-082f342d3fae/spanish_2_irregular_verbs_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b006dae9-8cca-40ff-a527-552242a7b7a3/fujul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6216aede-4404-4c31-98b6-6799575dfe2c/how_to_get_mod_dbz_budokai_tenkaichi_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bccb030a-190d-4157-b00d-38aa39621dd8/best_instagram_photo_saver_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941c567d-07fa-4473-a16a-8b3aa4cebfe5/mitofesiditojitulifunos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15efb2bc-f75f-4ce3-a572-b56a334a9072/what_makes_you_a_lefty_or_a_righty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20493908-77ed-47b4-9315-df650bf86d70/what_is_penal_labour_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1a193c-4582-4b20-a96d-e05a8c2421f8/rotaxuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f811215-ac13-41d7-a853-995b521f1b48/xomunalot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4559b8-395f-47f5-9dea-c1d878085647/sararetugaboli.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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 5388 bytes
SHA-256: ff0e6b0dfc1ce9590e4f7977944f122249c6978c9c6b115b3a2cf5b120e0b013
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 12516 bytes
SHA-256: d9543679e0a0c04a49f86095a4cc4915a5cc9b9bd144f3c9a8b86da644fab391