Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a0addf16d73652…

MALICIOUS

PDF

77.0 KB Created: 2021-05-10 17:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f3d4540662e8f15d7eb275b9058c8338 SHA-1: db740f833f8254a71034eee7ff82224a930fe720 SHA-256: 55a0addf16d736524ee959ce2c80b9df9dabdc9e930ea3eaba0e60b326a8e55d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used for phishing or malware distribution. The presence of 'utm_term' in one of the URLs suggests tracking or redirection, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=what+are+the+meaning+of+agricultural+revolution PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2c821731b.pdfIn PDF document text
    • http://pl50off.info/sony_dvd_rmt-d197a_remoteth5ap.pdfIn PDF document text
    • http://gixapovunugu.getenjoyment.net/1000_bucket_list_ideas.pdfIn PDF document text
    • http://bubokap.iblogger.org/13942370314.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/acidemia_glutarica_tipo_1.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/povonoposunexulepikuduxak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fde5f2d174c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5fef000dcf456.pdfIn PDF document text
    • http://gedagefi.22web.org/gevewewimezezoxinex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6062213b1a64c.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/anemia_perniciosa_causas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd648263c8b9.pdfIn PDF document text
    • http://zahlungsservice-ch.site/how_to_make_your_own_website_to_sell_stuff_for_free7pgwy.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/4951380162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://salajire.onlinewebshop.net/gebesaxefulojepivel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed4f6b2-3b8e-4184-8910-8c8a6ff863e1/zojotazarebapoda.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/21799685935.pdfIn PDF document text
    • http://zulonojaminipe.rf.gd/xorijadifiwupifuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef7e54b-9396-4f3a-abf9-4d03e20e9343/lolomopugitafulax.pdfIn PDF document text
    • http://tumajazumi.rf.gd/keracunan_arsenik.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/81255236762.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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5188 bytes
SHA-256: 8dff16edee6544f8c6dd4c940ce3161a0036f2824ea78f0b616cb905881ed017
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11076 bytes
SHA-256: 09c5e5035a0e4560b521071d2b111c7d7f079d738e7cec41e55245586e5c6cf0

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