Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eae3896f88624bf…

MALICIOUS

PDF

75.5 KB Created: 2021-02-07 02:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4b741f8c7f96be0b56b80822092f397 SHA-1: 9605fb728003fe10e133f75e32f48ec52322c892 SHA-256: 4eae3896f88624bf4df83ce0ae7ef4f991b2be58b0d1862ea396c637f77040cf
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to other PDF files, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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://leonvi.ru/aws?utm_term=fall+in+love+casanova+song+free PDF link annotation
    • https://cdn.sqhk.co/kagixepo/83gjjh5/amc_dental_college_and_hospital_ahmedabad_gujarat.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/cgchcY2/mdanderson_cancer_center_careers.pdfIn PDF document text
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/8260925.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/cggfSha/vewumaku.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/Tjajbhe/wufunitamop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takurugilij/barood_song_by_gurpreet.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/denture_base_shade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/puzuziwad.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/lalewip.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/representative_payee_accounting_report_online.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/glow_and_grow_feedback_template.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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 5064 bytes
SHA-256: 5ff3395bcd6ceecbf1ac9ef3ae2507f2218a18ffbcf50029698a3eab49a570a7
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 11180 bytes
SHA-256: a1356961b58fe1ed0767698be11a1f3092e0adcf2c9352ed2adf31373aae9371

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