Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfaf3d87de7f4e1…

MALICIOUS

PDF

76.5 KB Created: 2021-03-15 18:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2c38d3dfdf037635d5b8a7346505caa SHA-1: 7425f72d9e9e8ceb62d34e02572091a9ea6d9c46 SHA-256: fdfaf3d87de7f4e1a3ad8d624c3e0b667388ea0d9d81f06b4320e01a4b2dc706
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 0.9993

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://zajinet.ru/wix?keyword=summoners+war+second+awakening+dungeon PDF link annotation
    • http://wupunekum.getenjoyment.net/angular_5_tutorialspoint.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/93651733759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_603cac0466135.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/python_while_loop_list_length.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/third_abcd_letters.pdfIn PDF document text
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/laziwukiguxer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_60019b260afd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5fee867f8b128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_6019c3e959932.pdfIn PDF document text
    • https://wobajaxeme.weebly.com/uploads/1/3/4/3/134350369/03f9912bda0ac3.pdfIn PDF document text
    • https://lexapokugivida.weebly.com/uploads/1/3/1/8/131856754/5530963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483855/normal_5fca9592b8df4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcb2401c190f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fd91ba04e88c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5ff53cb3b2518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_73a1d4337c9c4b879e7c3c06cc6b7e17.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_f20660f4488e445a91dd5970d86f9bc6.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_9205725bd970457297d03d69519af9c5.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_62ff558bde774b269e4d616c5943276a.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/87667434538.pdfIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_a54dbba6723e4c27805d04baa7de3df3.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_289194cc3b12425585bf82b89f072a56.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_ae3557f5b7934b3c842d9276f25252df.pdf?index=trueIn 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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 5484 bytes
SHA-256: ea304072dc36310e5e92685eee368ad7d6e629dd4abed763688d24896ef89146
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10680 bytes
SHA-256: 6ddb18c1116668f5088a36692dc3ff1e9b3a89fe9e9e60b3ae49d943602ffb63