Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f3a9299b804ed2…

MALICIOUS

PDF

77.2 KB Created: 2020-12-15 15:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf3ec8be4a845f4a454bb301bc6bd3fc SHA-1: 92d1423c4f2565973960d51e93869e53e89884d7 SHA-256: 52f3a9299b804ed289586860002662672aad25cfb915d48bdb9214fd68604345
244 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, with at least one pointing to known malicious redirector infrastructure. The presence of numerous links, many hosted on disposable domains, suggests a link farm designed to distribute malicious content or facilitate phishing. ClamAV detection and ML classification further support its malicious nature.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?utm_term=fiora+guide+reddit In PDF document text
    • https://xirofagoxo.weebly.com/uploads/1/3/4/5/134576207/nodebabofonipet-borema-lepugidozeze-nijubiwudinegad.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/rusobotone-nopidogugu-ladobaridawi-bemofaxef.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/6796954.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/010f035b21e9f.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/miwidiwusejogujoni.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/xelikanotuzifaja.pdfIn PDF document text
    • https://gafanotode.weebly.com/uploads/1/3/4/5/134576189/9ad8ab5.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/megodipewukitoj/wogopakebuzod.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/navarejubelegufekidaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a6fb76-6b21-4be5-88bd-b63ab41f54eb/jexezotaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9796931f-1741-457d-8f0a-b799cb6b9d80/piercing_en_la_nariz_mujer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc792f4c89b935f15e2e9e3/t/5fc87664d6e0cc37e33dd427/1606973036938/tepomatusezumek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e963d55-c47a-4ae0-94f8-f36d1474f1b7/gifted_parents_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc566d10b6b03258f537d87/t/5fce378fcded405bb803d6c2/1607350160362/vivumiruz.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_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 4740 bytes
SHA-256: cfa2c4c110a65bfac1d9e09825608b613d9a2b7a9a42f9e277996f50afde1016
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10352 bytes
SHA-256: d0882efaa508fde2089defb0a321302bf4ac5fc220fcfcad35dcce752f711952