Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5e596a245d5a10…

MALICIOUS

PDF

71.5 KB Created: 2021-03-05 14:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eb87e25cf7915439401fc3ee02d77100 SHA-1: 519aeee823b412999a1446d685b33f7649ed22ef SHA-256: 4c5e596a245d5a101dbf4077d1c470335003f6031f18f5904a36b76f40b36b7a
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or SEO spam document. The presence of malformed stream lengths and the sheer volume of outbound links point towards an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://botokaw.ru/wix?keyword=mario+boss+remix+2 PDF link annotation
    • https://cdn.sqhk.co/giwumazusew/d4C3jhb/87216996446.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/KI5hejh/8467913573.pdfIn PDF document text
    • http://gutprod.xyz/banglarbhumi_app_for_pcfil0v.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/M8flkhc/joxajafaxazufigefudef.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/Zhiigui/59742660571.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/nGjjhbL/bathroom_toilet_randomly_runs.pdfIn PDF document text
    • http://usesucre.pro/el_pollo_loco_coleslaw_nutrition_facts74jij.pdfIn PDF document text
    • http://nuveclovet.xyz/24682755437l9grm.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/mivosizibafixozifojne64.pdfIn PDF document text
    • https://cdn.sqhk.co/vemupanilow/7ijheih/xakuzesepavotajulorama.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/ifHvYhe/lubotab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_107e263f08d24e6486eff65b87f09ad9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/davis_drug_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/wuvuxinidakafovidomiwuvez.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_12b8c99877b149bd8ae07ee825ec6561.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_716d164d09db40fab901476f9e9a704b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kevava/wulixoxivaromega.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_2ca4ffff4325431d93334d355f48e290.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogeguva/15440412247.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_d911c969da414a24a4a1092f61b69d83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/percy_jackson_the_last_olympian_graphic_novel_free_online.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 5144 bytes
SHA-256: 66382f950424095a51619ed1cec6b54dde235e40367a4470c748cd7625a44ff7
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 10368 bytes
SHA-256: 7a52ae7bc5f6969b20ca6059fc2b2c24210950c661c7513ff67fa246f43a0b0f