Malicious PDF — malware analysis report

Static analysis result for SHA-256 df70428dc417a0eb…

MALICIOUS

PDF

86.3 KB Created: 2021-06-01 11:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d9b17de446a88747a0e0d9f5b8f2de4 SHA-1: be4eda1fcbd3d2146008cf12d474ad9fca5b01ea SHA-256: df70428dc417a0ebf9be4f3b158ae1d79953b6ee9e72fa5cef5af4f4464e20e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to various sites. One prominent URL, 'https://infrive.ru/pbw?utm_term=living+and+nonliving+things+worksheets+for+grade+6+cbse', is directly embedded. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/pbw?utm_term=living+and+nonliving+things+worksheets+for+grade+6+cbse
    • https://cdn-cms.f-static.net/uploads/4486037/normal_6062a4671fe9a.pdf
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/fabb1a3e.pdf
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/koxabogabu.pdf
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/rivakiwefaf.pdf
    • https://cdn-cms.f-static.net/uploads/4391915/normal_6019044af1c39.pdf
    • https://kiburosipaso.weebly.com/uploads/1/3/4/6/134601321/sanatejaxame-mutatotu.pdf
    • https://sozivawar.weebly.com/uploads/1/3/4/5/134511290/8116c6d1e3d6126.pdf
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/garevulifofemumu.pdf
    • https://nitatodija.weebly.com/uploads/1/3/4/0/134012345/xufujalow.pdf
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/feruremun-xofegunamegeza-tozadiwu-busuk.pdf
    • https://cdn-cms.f-static.net/uploads/4496605/normal_602fff0aa4513.pdf
    • https://lupibifexedesez.weebly.com/uploads/1/3/5/3/135319255/b2c32fc5b384514.pdf
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/77f8632.pdf
    • https://wegefaraza.weebly.com/uploads/1/3/4/7/134703567/5410549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e557e12-d064-46ee-a0f1-ce24a14d6b4a/vista_21ip_installation_manual.pdf
    • https://uploads.strikinglycdn.com/files/8c70973f-1c3b-4235-ac4c-01f5da0ee619/41450502934.pdf
    • https://uploads.strikinglycdn.com/files/facf2d6e-a22d-4ea0-b6a3-cfcbe6fcaf55/natidol.pdf
    • https://uploads.strikinglycdn.com/files/48924e1e-8345-4a72-b135-7329c52769b6/59786517246.pdf
    • https://uploads.strikinglycdn.com/files/5868f3ea-02cb-4dae-a82d-d4286bb1e139/53722759247.pdf
    • https://uploads.strikinglycdn.com/files/158dcbfc-1f42-4855-8a44-cceb3a30d2f9/how_to_read_arterial_blood_gas_values.pdf
    • https://uploads.strikinglycdn.com/files/2bf0bf70-f37e-4329-a262-99acec1ed453/naxotuba.pdf
    • https://uploads.strikinglycdn.com/files/8ba3da38-fec1-4213-b0d0-3efb56c8158c/19474187392.pdf
    • https://uploads.strikinglycdn.com/files/7162d0be-510a-487a-be83-21899217cdd0/80462391241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113c9.bin
f965435d5f3ae43f32ddb28398e74c2ef174b3b7e7d62e8e17a22e16a5f1dd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 5736 bytes
font_01_sfnt_off00012769.bin
559a0b1e46d8b43ac8f9f524178bc6a496252912ef9d072ba79beb142cc7708e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 10608 bytes

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