Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b6e01ac0423b50…

MALICIOUS

PDF

77.3 KB Created: 2021-02-08 07:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 98203e1fa13562c8fb2199b511b04fbf SHA-1: 4aadda63d0c144eba56e5227260b6ef663ed2f93 SHA-256: e2b6e01ac0423b501854902564333c303c9f9d5906f5adcf0e1e86af35ade7f7
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to legal forms, which is a common phishing tactic. The presence of embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign.

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://crophysi.ru/aws?utm_term=acknowledgement+of+paternity+form+missouri In PDF document text
    • https://cdn.sqhk.co/venitalobeni/ehaidbJ/real_city_car_driver_3d_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fca60837f0de.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/gevezezaxu_nakawuzasokix_tajuki_kumesunito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5fd7ae3d92f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fde228a69a18.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/Y2ieidq/70935025796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_6010b41909d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_600ebc961a54d.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/dapepemo_vazexufod_dexorafulasopeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469103/normal_5fc61625a0d3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fd7185c460d0.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/womirofop/odd_even_numbers_worksheets_second_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/93238376923.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/air_core_inductor_design.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/nikemomevumakufuxovova.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/animated_responsive_website_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/bhajan_sandhya_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/39390375370.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/sudden_strike_4_multiplayer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/jawisemagizav.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_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5720 bytes
SHA-256: f3cad8e4f5f41dc8059550108e36bc311fae35e79f9fb065020136c0264b1b17
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10260 bytes
SHA-256: a3d45fa78aa4e08f5c9f5a4d9232f1f8e3d1bac9f89f0a3c840cc01e2180ee62

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