Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c6dd35cd8cea11…

MALICIOUS

PDF

73.4 KB Created: 2021-02-25 05:01:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4db352cdf2443391c513fa0ae0a32fe6 SHA-1: 55b39c693f6cb94b5d1912ac9b6901edc2518503 SHA-256: 88c6dd35cd8cea119d707500ed47c2485e7153df612d603f9fa2f8cf24289661
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV also detected this as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/123?utm_term=vw+manual+transmission+codes PDF link annotation
    • https://cdn.sqhk.co/zexukobesu/UghcFZS/28616186183.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/PeM4hbz/japiriboluburap.pdfIn PDF document text
    • https://nebutoribuve.weebly.com/uploads/1/3/4/6/134615115/gabevimixunurudiforu.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/storyboard_template_a4_portrait.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/dujeIXY/disney_app_store_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwejujorod/giehcF6/2019843797.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/iCAHsm2/football_coach_apparel.pdfIn PDF document text
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/520642454.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/paea_eor_family_medicine_study_guide.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/who_supported_johnsons_reconstruction_plan.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/rovazuw-zagaxojaji-jotad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 5024 bytes
SHA-256: 1379b5ce94177364e229b28762673d6b441124051940355ee2d9a3158e677b85
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10292 bytes
SHA-256: 9f004e668728f2573784e9fd54659817ce8e347784ac6e915dc6853a0a415ef0
font_02_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.