Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ccd305af90f33c…

MALICIOUS

PDF

77.0 KB Created: 2021-05-10 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a1a20281e9fdbfa42a12095929299b57 SHA-1: 82d7eab4ca6e6053651792d71f45a90c163f51c4 SHA-256: 66ccd305af90f33cfcd4a4e98e654ba495dfad1fb2bf57d3b728ebb81c934b94
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'Dr dre beats wireless headphones', suggesting a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=dr+dre+beats+wireless+headphones+won%2527t+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390052/normal_60353b56b5b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60504b441f2aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_602eabd82c38b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff8b223149e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5febb27b82d53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410199/normal_5ff2e239c03d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_606dfe78c150f.pdfIn PDF document text
    • http://kopatizukuxaluj.scienceontheweb.net/46112345047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fc86f6a855c4.pdfIn PDF document text
    • http://dekovag.mypressonline.com/manejo_agronomico_del_cultivo_de_arveja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_60245373dc2fa.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/jevefudoraxatirixabegezup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_602fb1d02d81f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5ff69cafb7a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_603a74ac2433f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fe95745aca84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_60539067171c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_60346f9779dff.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/lagena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_ce50bb1aeba34635b022ffa865731d7d.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_2f0210458e5a4bab97d6a3c5cc6a54a3.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5312 bytes
SHA-256: 3e965d1a87939901c69ad292bd229ed4125e11fd24c95dc93e770b1122e59b7e
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 11768 bytes
SHA-256: e43aed352db23f58878b18fa7a26e25df31dbad5327200f0cb23a4c90dcf9530