Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa31f4d770d5aae6…

MALICIOUS

PDF

75.6 KB Created: 2020-11-20 09:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 944dc056c09bba454c59185285cd739e SHA-1: 6851c151dd32a646cd982325a998b9f8dffbe02d SHA-256: fa31f4d770d5aae652ee549aed87ab372403d576b0d34026a0f4db8b8682be7c
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding of a link to known malicious redirector infrastructure. The PDF also hosts a link farm, suggesting an attempt to manipulate search engine results or distribute content. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence score strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=kptcl+admit+card++2019+junior+assistant In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5f962be277d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f9be8d21edd5.pdfIn PDF document text
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/658c9407f7e.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/5041229.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/8313917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5f92abee86065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8b1cf21f84d.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/f0eafa09-06ac-46d5-a9c3-c4016c5247e0/30321770149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cd28c9-5436-463c-96e0-1582341cd50e/proform_performance_300_treadmill_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/fuwibajexorezimolej.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/free_handwriting_worksheets_for_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/wuxevixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a6b828-4299-4356-8536-1cd8b1811832/reporte_de_evaluacion_primaria_2019.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 5744 bytes
SHA-256: 5161369a2bc0d164f5235067fc1630c022898bb494aff0b4290f38f243bc8c78
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 11156 bytes
SHA-256: 7ad7aa5ae50c3f4569bf6883c450e0d629bd037d733c45ca44900599ad4e736a
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87

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