Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada87b7d167a7fd2…

MALICIOUS

PDF

63.5 KB Created: 2020-11-20 23:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: acf9cbe17e50f77eca6103e2ae6c6507 SHA-1: 100f5c4e8fe424c632e07367f104db8fd0f5d6cb SHA-256: ada87b7d167a7fd2caec53421b0a71d5700e5f561680803090907b0d8be8e63c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to external sites, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

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
  • 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://traffset.ru/123?utm_term=identifying+transformations+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8839fba8214.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/43f9db53ee5.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/tazibabebamep/definition_of_commendable_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/australia_partner_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/gakaxobozibelo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/english_coordinating_conjunctions_list.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/airbrush_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/top_games_for_android_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/91938375471.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/vajekuzotidalibedarerike.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/street_fighter_4_mod_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9314960d-9ea6-436f-9346-5890d90a6ee0/rosario_de_la_liberacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d81d9d-1944-4cbb-8cc5-8bf909e243ee/tipico_coffee_buffalo_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/lentiform_nucleus_hemorrhage_icd_10.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_off0000bcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB6 5484 bytes
SHA-256: 7acdad8632350abc1f6c80921121b86633d3c655002f3b2418cf307fb30b9637
font_01_sfnt_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 9872 bytes
SHA-256: 86c13f2ac6f12081b52024f20e843fef412b876d27270028f168e29afeef9c7f

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