Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db5fe90e6d7ee2d…

MALICIOUS

PDF

66.7 KB Created: 2021-01-01 09:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7396a29ecdee6b88fd3685a2e3c6dab3 SHA-1: 949cfadc365749935f67cf99696fb33daa01ac20 SHA-256: 7db5fe90e6d7ee2de08fbf67ff535d9aab541d0d70b37ea9b84c04e1784f1125
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. One prominent URL, 'https://traffking.ru/123?utm_term=download+slingo+daily+challenge', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=download+slingo+daily+challenge In PDF document text
    • https://jewibotiguduxi.weebly.com/uploads/1/3/4/8/134864220/milazorovogin-bojirepawezor.pdfIn PDF document text
    • https://movudari.weebly.com/uploads/1/3/1/0/131070737/7819287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_5fadf2c96ea1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480749/normal_5fc59efa0319c.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/bosipalotetabuneki.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/gunad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369651/normal_5fe216f499175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5fd147c40bbc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476954/normal_5fe9ba86c2b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_5f981b051a985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480758/normal_5feeabcbaf3d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74101854-a28c-4c21-8ec4-2ac241f37a31/45900004241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68c5527-d1a5-4505-9b4a-81226155580e/78723360179.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/problemas_de_leyes_de_senos_y_cosenos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e663ff68-a814-47ff-b373-8e9b4db92fe3/56352227146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90cddbf4-221f-48d8-9f22-51ac03c525c4/watch_pitch_perfect_1_online_free.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_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 5296 bytes
SHA-256: 9d86ef3d0e5bad199d4b215fa6803822abbe1543fd04bb33f1ec145bbb2311d0
font_01_sfnt_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 9916 bytes
SHA-256: 63c57947a2bd5fcfff0ad079d9d936834833afcd6ca4b034ee086ee96d02e617

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