Malicious PDF — malware analysis report

Static analysis result for SHA-256 557333e483852ab0…

MALICIOUS

PDF

75.1 KB Created: 2021-01-13 03:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9659ee683a229f7d4d7b2afe5308ac26 SHA-1: 28e7cdd0d2788ac69d3e8c7a21b452434501a7de SHA-256: 557333e483852ab0163a9d390e71f83ff8bf3e12a18a4cf85baf4c89e4fff0a4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://trafficel.ru/aws?utm_term=brazil+visa+application+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ffda20961f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f9e223b7c2cc.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/1742069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f8dd067c635a.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/vewezokotibiven.pdfIn PDF document text
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/fizewimon-denuwuveva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_5fd322ca66f89.pdfIn PDF document text
    • https://badikodaxalele.weebly.com/uploads/1/3/4/6/134698448/jemunuvutoxim_mikixetigiz.pdfIn PDF document text
    • https://site-1180969.mozfiles.com/files/1180969/55939203103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_5fbce4ae898ec.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/rovuweraja/chemical_bonds_formed_by_electrical_attractions_are.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/amritsar_express_11057_dadar_platform.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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 5320 bytes
SHA-256: a92ae8e8e8d383be8439240ad2ba987e0884c37dbaab0aced34dbdb857c799d6
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 10428 bytes
SHA-256: 6a28e2a3245a66156e42eb629f7a6f9de38dbbfa17f39d439cd4456728aef223