Malicious PDF — malware analysis report

Static analysis result for SHA-256 81523c1ba6a19dcd…

MALICIOUS

PDF

67.5 KB Created: 2020-12-10 11:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dce305621f1fdf75c70fed8254305dfa SHA-1: 9ddb1db1f1794b5b0bf0767d4d4180f6e46db1c2 SHA-256: 81523c1ba6a19dcd934defbf9d4d5bd3a74856ac096e7efca55dc101cb9bcadf
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 0.9995

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=what+is+polygenic+inheritance+explain+with+the+help+of+suitable+example PDF link annotation
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/pezubanuzigikutojaf.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/b76e542a-4a29-44fc-a0fc-64495350ce76/21387830111.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f319ab79f442f229e2d8/t/5fc2f6c1cb3e0f5771b2408b/1606612673841/jefubumeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ac888b-6f8b-4ef4-b967-f49c3e23cbd9/msi_geforce_gt_710_drivers_windows_10_64-bit_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38175949-e6ff-4c97-acb5-ea21a522afa5/letras_goticas_mayusculas_y_minusculas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d3998a-b141-40a2-a5f3-688906b6b408/dujun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b65d6609fd0ee7b27781/t/5fcbf9f15d2e6f3bda270e4e/1607203314201/fazomebeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87270e81-ce04-4106-8151-486fb3562684/xakoloxegekoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed86198-973f-44d4-98b3-128206a75a03/60857810246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21da790e-cc8b-43cd-9a40-4aabac3046ce/13358692636.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_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 5844 bytes
SHA-256: 836940f890c85bb1541534161bdc7637c081bd4625fed23d7192be06f0ec49f6
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 10268 bytes
SHA-256: dd1bb6ca451558a4568f55f9330007f669462798989d84cc8b2a128b3a11012b

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