Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37283bb6164f85b…

MALICIOUS

PDF

68.2 KB Created: 2020-11-11 14:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fbd7d6c9c00bc3fe2292485685dac348 SHA-1: 26d15945cd9b93852d8cb39a40c4d42debf8cfa7 SHA-256: d37283bb6164f85b4a35121398c50cdfb933b983e802ff18d430f8607f458d8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The presence of an external URI pointing to 'trafficel.ru' further supports this, as it is likely a phishing or malicious content hosting domain. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=nick+groff+divorced PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390680/normal_5fa378b39fe00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f873d7ade1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fabc33154caf.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/komexirokomejojake.pdfIn PDF document text
    • https://gosedizomomusuw.weebly.com/uploads/1/3/4/3/134313056/3fa3a900b6cc3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5fa515560d784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fa61c5997411.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/096c2e50-f332-4833-81ec-1f9fa1c47b52/fuvibir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9389b12e-4576-49ad-8f29-dd999c859ef3/staar_test_2019_answers_key_7_grade_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1a4f3d-3d60-4a55-9d4b-93004cec0eac/nebejol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8da25e-3203-4d08-a630-f20d4e605686/kill_the_doll_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa2e2ac-2507-4fe2-9f11-cf5344e70901/lemomovikoremujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef74d4e-6c14-4136-a862-107683efd758/22750851737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda0ff53-e78f-40d7-b6fc-6b90cb38b422/samples_of_invitation_letter_for_us_visa.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_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 4860 bytes
SHA-256: 3e48a68602b7bc87d6192bb3dd1edfaf4111a2983216e5b6aac173eebfb81b2d
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 11044 bytes
SHA-256: 7abfe4da8a5a3cfefdf4ca8ca43130470f7f4bf94723d46d186bbb249aaa7f51

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