Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab53a90dda5070f…

MALICIOUS

PDF

93.4 KB Created: 2021-01-09 15:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 93fb8c1a41c82df0f8a026341355c8e5 SHA-1: b14aa626a59058b2441ba18ac33b566ef1b5e224 SHA-256: eab53a90dda5070ff5ebbe2244ac95b0f4317c74f03270d50f8bb562c9062924
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, including a critical finding of a link farm pointing to malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, with one pointing to a potentially malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=22+lr+subsonic+ballistics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5fac3b11f397d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_5f962a618a8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426974/normal_5fe97dc0eb964.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/e6geije/gamefly_free_trial_charged_me.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/9dgifie/49897728981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fc8d46611b33.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fe5ea4337232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fe9cf9ec4823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402247/normal_5fcdfe631e870.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/dowadotiju/autodesk_maya_2014_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/pegotisurasalanomikakawes.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/53852575437.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/mision_y_vision_de_asociaciones_solidaristas.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/rofotiliru.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 4972 bytes
SHA-256: af3154b3e6729147704413200d0e6a54cc245eb9376fc4cbadf7d2725e0b4afa
font_01_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 11876 bytes
SHA-256: 1397a01a52f4ea688c5372167466d365f23e73697185e5cd67fce1b9fcdb1a79
font_02_sfnt_off000153dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DD 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

Open this report in the interactive analyzer, or submit your own file for analysis.