Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19ea8a6cbdda649…

MALICIOUS

PDF

141.7 KB Created: 2021-06-08 07:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd6b183356dd01fb509a073eddb674cf SHA-1: 0c12fc33354cc541221428cb62019966625940df SHA-256: d19ea8a6cbdda6499fb610bfa5b3afbfccc70898107099d1a27960a2771a2a68
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 pointing to other PDF files, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=guide+ivern+s8 PDF link annotation
    • https://balewurid.weebly.com/uploads/1/3/4/3/134307256/rifij-pejezinajovuv-zitida.pdfIn PDF document text
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/8201814.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/3947066.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/b00541dd-cc06-41f8-84cd-ddd2b5c5ddda/wulojusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d90bdb-a7a6-4683-be66-d391ecc7a95b/what_is_the_biggest_factor_in_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f869faf5-9be6-426c-b363-852e744bce1d/carpentry_and_building_construction_6th_edition.pdfIn PDF document text
    • http://mopegup.pbworks.com/w/file/fetch/144813108/givubomevas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6b7ab6-c81e-4e8f-a7cc-dd5774aa9674/99894804772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beaee14-f718-4fad-aa06-3cdca448b9e5/38603010524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec58535f-5d8a-4ea4-86e8-12185e334a26/ap_biology_properties_of_water_worksheet_answers.pdfIn PDF document text
    • http://wenitat.pbworks.com/w/file/fetch/144552483/5704333471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b172085a-83e1-442d-a5ce-3cac3e3ed5dd/10774471118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae38856-2bac-46f9-81a9-88365ac977a2/differentiate_impressionism_and_expressionism_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6988cf-935c-47f4-b2b6-53933f0c8ab7/practice_and_homework_lesson_9.1_answer_key_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807e65c3-a72e-498f-9bcf-c4528225c8fb/how_do_you_become_a_blacksmith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f3ea6e-8697-4d4f-b049-ce4e1837c4d1/canon_printer_mx300_troubleshooting.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/balasaheb_shinde_marathi_vyakaran_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc651e65-7320-4be4-8c6f-c508fefe1426/98861059783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887163ae-c9a4-416e-8a4a-1b2d2690b401/46894791993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90521b74-eae6-450a-8824-412b411a325a/wewusenoxotipeleduxavuvim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3FA 4860 bytes
SHA-256: 3ca928e3cc05e29af70f0ea89c0d84d160ef2a6ccb027d0021364d1c3b1f5342
font_01_sfnt_off0001e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E49E 15044 bytes
SHA-256: de17a3a7d835a0184e433f61c40bf5522bbeb2fb5eb97303e082ba1ea6744cf7
font_02_sfnt_off00021291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21291 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f