Malicious PDF — malware analysis report

Static analysis result for SHA-256 6019b158291b0642…

MALICIOUS

PDF

70.2 KB Created: 2020-11-10 09:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d04d193d85043377342108f27873e80 SHA-1: 7e47d66a4a78fe87d469dd60c4a1850053e27106 SHA-256: 6019b158291b0642e8af9cf75a43784cdd165a8f36e0645660dac07103d68c94
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?keyword=gmail.com+gmail.com+yahoo.com+mail+sign
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5f9395a21a881.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f95496a2e908.pdf
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/sopojagodama.pdf
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87abef45c57.pdf
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f95f2461c6d9.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/8631945.pdf
    • https://cdn-cms.f-static.net/uploads/4455894/normal_5fa2da74bb598.pdf
    • https://cdn-cms.f-static.net/uploads/4443617/normal_5f9df68624270.pdf
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f89b35397c93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59b98b57-9c3e-48d1-93b4-51a4a868d624/zijoxakurubakuzezorevogur.pdf
    • https://uploads.strikinglycdn.com/files/f8e653d7-01c3-4a39-9beb-8f70136722e8/bianca_lawson_doesn_t_age.pdf
    • https://uploads.strikinglycdn.com/files/89174d08-51d2-4997-bd64-7c46cbd36fb9/64430274811.pdf
    • https://uploads.strikinglycdn.com/files/6a11b4fd-46f5-45e6-8889-9cfb84563507/divinity_original_sin_2_hexentrank.pdf
    • https://uploads.strikinglycdn.com/files/211affd8-ad84-4132-a2e2-ff259e3f35df/escambia_county_arrests.pdf
    • https://uploads.strikinglycdn.com/files/bea7b834-059c-41c1-ae8a-cdc839e11a91/an_introduction_to_clinical_emergency_medicine_2nd_edition.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_off0000d637.bin
a47790de77f6e3c38f603a2d0100d88c757e85722e68264a55e1fa71e240fd47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 5280 bytes
font_01_sfnt_off0000e816.bin
d479d1e478ac5e0d20c07bd3b827c666fe71cfb53eef2aedf3cbda815d0deac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 10308 bytes

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