Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4579e6851b4b2b…

MALICIOUS

PDF

74.5 KB Created: 2020-12-21 07:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 975914fbe70eb915227e06db10a00246 SHA-1: d1baafd48123afdbd03a656e9fc8d4acf88fff41 SHA-256: ef4579e6851b4b2b9315bc62113f9c29734b074a5806d571bc27f786c54dbe92
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://trafficel.ru/123?utm_term=columbia+men%2527s+antimony+iv+insulated+jacket', appears to be a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or a link farm for SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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=columbia+men%2527s+antimony+iv+insulated+jacket PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5fcd121d017e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fd78c630482d.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/fe13a1366835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5fcceb11b85f4.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/zuzawalaxoki-tetubetinulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2e44d830-9a45-422b-9fc8-8d8fb8f32157/newuwanugovatefavamirafu.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/drakensang_guide_mage.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc702bd03f04e270fe2153a/t/5fd6ddeb226e9048fac98fa6/1607917042978/52838126680.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/google_chrome_free_for_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa9c7e5-397d-41a7-9f1a-147bcc6cbf8f/10959512858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1eadaf-a122-4a05-9606-9c1e74d560a7/enhancement_shaman_talent_guide_bfa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfcd3607af9e0e1603aa2b/t/5fdfd69515a11837d0c777f2/1608504982111/losib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc124912e34347c70458bc4/t/5fc55e43cb3e0f577102e3ed/1606770245909/dupabobajalotov.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde965d822e9979dac69868/t/5fdf0e2815a11837d0b37f7e/1608453672977/novel_ceros_dan_batozar.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 5368 bytes
SHA-256: 6621b96c1259d0b69a35869807ee67a361848134b7d6d381fba1c8bfbf30e3bd
font_01_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 11904 bytes
SHA-256: f72bc2b0e84e0e1d60702308da18c9bc24572f46890dde843b575b3575518c75
font_02_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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