Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5976b76cc25481c…

MALICIOUS

PDF

68.0 KB Created: 2020-12-17 23:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cc99db9b0a3a715f5bda1299ba02d9de SHA-1: 90e5f607cde4ec4048bf14fb74131fc801680abc SHA-256: d5976b76cc25481c8e8e9dea7050787d31ab4cb6b34ba10f73b56b83364b3ace
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://trafftec.ru/strik?utm_term=skinny+thinking+pdf PDF link annotation
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/3908386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f877adfcbfbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_5fa858dfe9f55.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/af4c0f64-e770-434a-8fad-4d6f638e0b0d/bud_not_buddy_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ac8421-9a36-48a1-bc0d-13cd71eb6291/transmission_range_sensor_ford_f150.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/81081668616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d047d5-ee9c-4644-ac42-db79aed24687/legends_of_zelda_ocarina_of_time_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9e079f-d464-4f2d-9ccc-4bff16b16df3/35076507790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6499c956-e959-4a85-9b22-62dbfabba894/bufiwifuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e336c945-e5e7-4c2a-89df-95fe17b3f4f1/pathfinder_kingmaker_best_monk_feats.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553872e537a05ef266587/t/5fcc77a71e1a4d7de123651d/1607235496397/bamitol_para_que_sirve_en_humanos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce48d52cf4ad19c3ac5f73/t/5fd6c77e96ed101a3e503ca5/1607911294744/luwekezubakawu.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_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 5056 bytes
SHA-256: c10225119595dcb1f19f270b50588b35b540d1566d8a05ba6c227b41eadc08e7
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10344 bytes
SHA-256: 343d8926e2be309b2278116afcb6b4730188ebccba8fb504a53ae90faf72ea32

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