Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a8e91eea3f30af…

MALICIOUS

PDF

72.9 KB Created: 2021-03-10 03:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ceb44f45f208a5e2689e119050b245d0 SHA-1: 178f9ecdb4f8050438f925e4d874110a3ee191f9 SHA-256: c4a8e91eea3f30af403bd308657454b5b29dc5030cfe5dc87dd253c90a755edd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/award?keyword=sdgs+united+nations+pdf PDF link annotation
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/7702475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_6047fce87c226.pdfIn PDF document text
    • http://olx-delivery.cc/what_does_the_new_moon_mean_for_aquarius37z1n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_6019ab58b231a.pdfIn PDF document text
    • http://filemarker.store/9595211433532cif.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/9557342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fcf17f7b5c72.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/napejaxosinages/aditya_birla_sun_life_mf_fatca_form.pdfIn PDF document text
    • https://0b902d11-d057-4dfc-bffd-bcb57e9ba729.filesusr.com/ugd/696b8a_845a1316c6f74ba7af622a2b3660d83c.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_aa4e41c300b349f69f1856ed0d98826b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/33226041928.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_da3e988be76542f0aec8111ee0b33dda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/jagopumotibofofatidotenu.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_3e76ce120be748e7bb86a9ca481f164f.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_912d63e175224f3a9388b831e79de55f.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_d39e5af063a04fb58e090368d8b80888.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/grammar_tenses_exercises_with_answers.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 5184 bytes
SHA-256: 52c5c9f3864cc3eeb6838a2dc9ff6ed6db3d6fab88731d31be91f6f19592eec0
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10032 bytes
SHA-256: aa94c4463a2dfb871f25fc2837511d8fd3b15b263ea94be0f4adec71e5d5a69a

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