Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceae8ee81758c6e0…

MALICIOUS

PDF

80.9 KB Created: 2021-04-24 00:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2517f053ab55bf766e65fdf1be8a8711 SHA-1: c535d933410b3d7a8573206e78a342a55028ae68 SHA-256: ceae8ee81758c6e0e047feae27dbf3d952aa1a613e41404177af17a17ab45b1e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=2017+amc+12a+solutions+pdf PDF link annotation
    • http://buwubaled.mywebcommunity.org/annie_leibovitz_biography.pdfIn PDF document text
    • http://segolepeponiv.iblogger.org/tai_chi_silk_reeling.pdfIn PDF document text
    • http://dom-bita.org/tugoveko6m892.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/rugisibarurub.pdfIn PDF document text
    • http://aycotoro6.xyz/kamasutra_3d_movie_onlineullwy.pdfIn PDF document text
    • http://lavkavkusa.store/xuxerivezasasalomuth6p9v.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/6614205.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/multipart_form-_data_and_json.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/water_supply_and_sanitary_engineering_s_c_rangwala.pdfIn PDF document text
    • https://gemumumesuligiv.weebly.com/uploads/1/3/4/3/134318519/801622d2d.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/8643a1103d6a87.pdfIn PDF document text
    • https://vofamebibefa.weebly.com/uploads/1/3/4/6/134694090/zunokisitiwo.pdfIn PDF document text
    • https://sapefita.weebly.com/uploads/1/3/0/7/130776655/5507208.pdfIn PDF document text
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/zupafivoso-zusamerumefiv.pdfIn PDF document text
    • http://rewita.fun/tomumazumegabutegatpe4to.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_0e483b861cc84bb0bd9d269816114625.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_35c9f1a84b4a40c18c98205b92386229.pdf?index=trueIn PDF document text
    • http://pisobugesonanin.epizy.com/allen_jee_main_test_series_2020.pdfIn PDF document text
    • http://noxexisotagizez.epizy.com/witcher_3_troll_riddle_answer.pdfIn PDF document text
    • http://xewuvafamimeze.rf.gd/zigutileromali.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_b41ad0c43c6e40c7964f51a12b7667a6.pdf?index=trueIn 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 12104 bytes
SHA-256: a30a75f8e9658221be07d746f424e5dc0aed259228e15ab05e7f412c3015e940
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 5516 bytes
SHA-256: 9cfda12893de7af8ee68997d02d905b519feff63823ab23621e61189da64e3e8
font_02_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 10676 bytes
SHA-256: cd1eb48f136497334f19fbf6d706f6ffa2dac412ad7aabd2605a85fc09015697