Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62dbbff02d8f37e…

MALICIOUS

PDF

77.3 KB Created: 2021-02-26 03:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fde52fff8cdc618042d6255d3c053e7d SHA-1: 483effdec51bc599d19760ba5198bccdc9259933 SHA-256: f62dbbff02d8f37e6cd9bb56645dabde64d0b3c3790209a5d634e0ea8812254b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or redirection scheme. 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 embedded URIs are indicative of techniques used to redirect users to malicious sites.

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 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.
  • 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://leonvi.ru/award?keyword=karuna+reiki+symbols+and+meaning PDF link annotation
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/e2225058.pdfIn PDF document text
    • http://potolkilife.ru/metal_slug_3_spriteszdpdk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcee31fcbcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_600bbb9fea76c.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/semubejazijig.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/wetusuzugoxo.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/6a24b.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/dusined/6388635473.pdfIn PDF document text
    • http://pifutujotot.epizy.com/for_elise_piano_sheet.pdfIn PDF document text
    • http://xupasafagimi.rf.gd/leave_application_template_for_school.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/how_to_put_ipod_nano_7th_gen_in_recovery_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/windows_10_update_assistant_versi_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/conversion_between_units_of_measurement_worksheet.pdfIn PDF document text
    • http://tujevudaxuxos.epizy.com/forsythia_planting_guide.pdfIn PDF document text
    • http://gerufufa.epizy.com/archaeology_magazine_2018.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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 5420 bytes
SHA-256: 6402c1b73fe2059a16ab087207485c32af18eeae84d3acbb8ba0c08e1aeedf24
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10616 bytes
SHA-256: 1d634dfc4d190f5c266ef46dec0b2e8f2c626a81208288ea51cb0b1d567e0f55

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