Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da6f6cc4d2232f5…

MALICIOUS

PDF

81.3 KB Created: 2021-03-12 21:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 23a7ade726b9ca8768c4410018c7f5e5 SHA-1: c2ed9cef22e636286f3d3112130cfdc43282ae30 SHA-256: 5da6f6cc4d2232f5d3f7d9c6e24bde8385ad2850eeefe9454063c444e614cc19
156 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 of which are SEO-themed and point to other PDF files, suggesting a link farm or phishing lure. 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 numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=water+animals+pictures+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491936/normal_602c4c1d8d1b7.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/zalerufumus.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/iggchiI/ar_sandbox_software_installation.pdfIn PDF document text
    • https://zipapujemufosir.weebly.com/uploads/1/3/5/3/135392102/lexaxopememejizi.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/fowhiIi/17368239240.pdfIn PDF document text
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/tetilumobunisex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fdd5c2169de8.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/nuraje_fefugapujikok_tinubefesoxedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5fcb101664331.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/dbcdf209090.pdfIn PDF document text
    • https://widedajixefur.weebly.com/uploads/1/3/5/3/135312737/zunipewan-zasinojuse-ximeda-lomovinu.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/e5d38c1.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/jovekus/xenusarekikedifewim.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/different_breeds_of_cattle.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/oracle_java_jdk_8_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/european_cardiac_arrest_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/zujiwokife.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/graphing_trig_functions_matching_worksheet.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_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 5312 bytes
SHA-256: c48d68c02a70122eefa982fdd1da9d9b61d963b984c2d7c99024f87c4ecaa32d
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 4988 bytes
SHA-256: 4ecccce391491f7e40418c8e75a90f5548d0bee9bfa7f43137bdfd5e7695b77b
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10348 bytes
SHA-256: fa5cb10589ea9c59dce3940f41457a1579cc7894f677193fb52f552ed5930663

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