Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ada69cdd9ec57a…

MALICIOUS

PDF

82.7 KB Created: 2021-03-19 08:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0ca66007c4be112b6018724b92584b90 SHA-1: d2513ea006d0beac4585878812468505100e9c6b SHA-256: a4ada69cdd9ec57a9f5ac65dc8f2974d9f21c41ffec07d4de049e61588737fbb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=just+already+still+yet+pdf PDF link annotation
    • http://omoikiri.info/46504008059523h7.pdfIn PDF document text
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/vafurujiju.pdfIn PDF document text
    • http://reduslim-europa.site/nsc_defensive_driving_course_10th_edition_answerskswko.pdfIn PDF document text
    • http://peuly.xyz/what_are_the_examples_of_farm_structuresj4war.pdfIn PDF document text
    • http://grampus-shop.com/tree_of_savior_mounts1jzde.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/lekebuduta_karozilitiw_navujukud.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/rarit.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/8e0c59106.pdfIn PDF document text
    • https://xakepimefinawam.weebly.com/uploads/1/3/4/9/134903333/jojulozedifuzexobawo.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/nodalolilelovuf.pdfIn PDF document text
    • http://life50it.pro/durango_boots_size_guideraq13.pdfIn PDF document text
    • https://fotularujofo.weebly.com/uploads/1/3/0/7/130739653/703528.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/b8eed83e-62dd-4360-9581-d34cd0d85986/pimivaximosonasusowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1f18d4-cf21-4b00-8caf-9520247b31ce/rilonudotopunonebijeruve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d9ed2b-0ff1-4c38-8ae9-f8743cc9da82/nelelopureniwe.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_7061ec61f8ad43fabe939bad82a19316.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/aaruthra_tamil_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/ncert_maths_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/formosa_chinese_restaurant_stafford_va.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801ca200-57ae-4a9a-9fc9-4bec88bef3e8/what_is_novice_to_expert_theory.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_70a69ff9ad7f4e4cb5fffb7e83bc3262.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/poliwujudim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 3284 bytes
SHA-256: 4d3ea8e8e7d44c8616f19f3521fb9c7d21dc522ee975c993cd99f36924f54bf6
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 5128 bytes
SHA-256: 3ccb933e187a9923fdfdeece68a324ba86e69be9b6be14eac57fdd662f01dbda
font_02_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 10968 bytes
SHA-256: 5d64c79f58c1931301c0139d5c81ccfc796c11f08767d38e83f7ac6a1799ed3c