Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab5b07875116824…

MALICIOUS

PDF

68.4 KB Created: 2020-12-01 22:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2677f5bc9313034f1978c6eb3273b3b7 SHA-1: c61fafb6f647a01af4bc181c24ea8b8119823f24 SHA-256: 7ab5b0787511682400f5af71aa5a8d67f812c0a7dadbcc6e9a64f554ec321656
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with numerous embedded URLs, including one pointing to known malicious redirector infrastructure. The primary malicious activity appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/123?utm_term=focus+define+earthquake In PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/7aa010c47adf1.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/8532723.pdfIn PDF document text
    • https://bazojarazete.weebly.com/uploads/1/3/4/6/134650598/6d6d483efe2fc22.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/9f592683-da02-4ba1-b749-70858894f96f/biwupututedapifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/xidorokojesuwoxudikinira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d109508c-00e2-4ccc-aa3f-0c902a4dc58e/freedom_apk_no_root_download_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/vutujimefafojoxezazuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/nosigufokosigisatadi.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/read_warriors_online_weebly.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/gifuxegusudubodelofesenej.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_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 5220 bytes
SHA-256: 9b22bc0923890a708c8e6aad09cb89c5e7ec665d537e7cd41ee6927f3247e7c7
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 10912 bytes
SHA-256: 05aa414049d7a28f21d0d212e44c6655dcebf58c987224faedb651a4bf494cf3

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