Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e869038bcc17d3…

MALICIOUS

PDF

70.2 KB Created: 2021-03-02 05:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63b3be7e17ee25980cf4bebf6d8741ea SHA-1: 95f5b712511589cc1b8f002d4df5693f101bc8fc SHA-256: 87e869038bcc17d3b7ebe86696c3cf6e72d9de1239bef84b5bc7208c59fea56d
156 Risk Score

Malware Insights

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

The PDF file contains a mass external PDF link farm, with one prominent URL pointing to a site that appears to be used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=skyblock+map+for+minecraft+apk
    • https://niremavepuna.weebly.com/uploads/1/3/4/6/134625676/92b495ef73.pdf
    • https://cdn.sqhk.co/gavezexu/eHRifM3/regular_show_prank_callers_dailymotion.pdf
    • https://cdn.sqhk.co/butituguxur/c47Fobz/backyard_baseball_2003_scummvm_download.pdf
    • https://cdn.sqhk.co/sifomujotaxa/TicAhjW/8035847645.pdf
    • https://cdn.sqhk.co/banuluwopote/hig1fih/30479495514.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/b40d706c3503d.pdf
    • http://shoop-fh.ru/poziwukegarv96e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rimejiguvif/engagement_invitation_templates.pdf
    • https://s3.amazonaws.com/jukezeluf/30338665535.pdf
    • https://s3.amazonaws.com/wibedubosateg/terms_coefficients_constants_and_variables_worksheets.pdf
    • https://s3.amazonaws.com/wunojipu/soothing_relaxation_music.pdf
    • https://s3.amazonaws.com/vatosolikijike/kekimifikulebojijet.pdf
    • https://s3.amazonaws.com/xuzakob/affidavit_of_residency_template_philippines.pdf
    • https://s3.amazonaws.com/lunojol/41992414235.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ff.bin
85643f4c9931a9d1053d14bf70746d834bdc40bcf3abcd3ef63486a800bcf291
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 5392 bytes
font_01_sfnt_off0000e852.bin
bc06829cfc30dbef5ac66f7632ac140c799150047d8e0414751b2a4975201e14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 10412 bytes