Malicious PDF — malware analysis report

Static analysis result for SHA-256 181e75e9fa503520…

MALICIOUS

PDF

75.2 KB Created: 2021-01-14 00:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a3735dd92af7fcd8cf809699d0e3e97c SHA-1: 8fa43e19a29968779ab6c94722a0f9dae4f0b124 SHA-256: 181e75e9fa503520fcb06b78cf553f0f3cf2a99387a33d9b6b9cdb01be552247
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external content. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?utm_term=gndu+date+sheet+2019+ba+4th+sem PDF link annotation
    • https://cdn.sqhk.co/jisepozidis/idicRja/93269330857.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/geeiiie/10159277812.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/A9vicMp/learn_50_languages_apk_download.pdfIn PDF document text
    • https://site-1166657.mozfiles.com/files/1166657/best_kpop_store_in_nyc.pdfIn PDF document text
    • https://site-1177407.mozfiles.com/files/1177407/danelelidupitukiwuna.pdfIn PDF document text
    • https://site-1177693.mozfiles.com/files/1177693/yearbook_page_design_templates.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/suvenezoxivel.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/928881.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/Nibgheq/fowavatorixixujis.pdfIn PDF document text
    • https://site-1180366.mozfiles.com/files/1180366/agenda_2030_de_las_naciones_unidas.pdfIn PDF document text
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/631670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fe2dd08df311.pdfIn PDF document text
    • https://kutabafimuv.weebly.com/uploads/1/3/1/3/131379381/5415708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/vagiligabomanoxajata.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 5676 bytes
SHA-256: 3d0c875022db58bb07da2a2f4c6eb8a1a09d3abbabf8d744cdcbc2c225838913
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10612 bytes
SHA-256: 9da6d070d119fdeeade1df46a88d1c305ff4657c348707aeb815847bba610c20

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